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ipq806x: add QCOM SMEM based MTD parser
This patch adds a new parser which uses the SMEM available on IPQ and some other QCOM platforms to map the MTD partitions. Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org> SVN-Revision: 46657
This commit is contained in:
John Crispin
parent
6529d23267
commit
0e33ae8e5d
@ -0,0 +1,277 @@
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From 0501f76b138cf1dc11a313bb7a094da524b79337 Mon Sep 17 00:00:00 2001
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From: Mathieu Olivari <mathieu@codeaurora.org>
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Date: Thu, 13 Aug 2015 09:53:14 -0700
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Subject: [PATCH 3/3] mtd: add SMEM parser for QCOM platforms
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On QCOM platforms using MTD devices storage (such as IPQ806x), SMEM is
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used to store partition layout. This new parser can now be used to read
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SMEM and use it to register an MTD layout according to its content.
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Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
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---
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drivers/mtd/Kconfig | 7 ++
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drivers/mtd/Makefile | 1 +
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drivers/mtd/qcom_smem_part.c | 231 +++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 239 insertions(+)
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create mode 100644 drivers/mtd/qcom_smem_part.c
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -200,6 +200,13 @@ config MTD_MYLOADER_PARTS
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You will still need the parsing functions to be called by the driver
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for your particular device. It won't happen automatically.
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+config MTD_QCOM_SMEM_PARTS
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+ tristate "QCOM SMEM partitioning support"
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+ depends on QCOM_SMEM
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+ help
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+ This provides partitions parser for QCOM devices using SMEM
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+ such as IPQ806x.
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+
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comment "User Modules And Translation Layers"
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#
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--- /dev/null
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+++ b/drivers/mtd/qcom_smem_part.c
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@@ -0,0 +1,231 @@
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+/*
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+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/device.h>
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+#include <linux/slab.h>
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+
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+#include <linux/mtd/mtd.h>
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+#include <linux/mtd/partitions.h>
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+#include <linux/spi/spi.h>
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+#include <linux/module.h>
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+
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+#include <linux/soc/qcom/smem.h>
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+
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+/* Processor/host identifier for the application processor */
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+#define SMEM_HOST_APPS 0
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+
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+/* SMEM items index */
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+#define SMEM_AARM_PARTITION_TABLE 9
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+#define SMEM_BOOT_FLASH_TYPE 421
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+#define SMEM_BOOT_FLASH_BLOCK_SIZE 424
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+
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+/* SMEM Flash types */
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+#define SMEM_FLASH_NAND 2
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+#define SMEM_FLASH_SPI 6
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+
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+#define SMEM_PART_NAME_SZ 16
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+#define SMEM_PARTS_MAX 32
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+
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+struct smem_partition {
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+ char name[SMEM_PART_NAME_SZ];
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+ __le32 start;
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+ __le32 size;
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+ __le32 attr;
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+};
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+
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+struct smem_partition_table {
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+ u8 magic[8];
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+ __le32 version;
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+ __le32 len;
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+ struct smem_partition parts[SMEM_PARTS_MAX];
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+};
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+
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+/* SMEM Magic values in partition table */
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+static const u8 SMEM_PTABLE_MAGIC[] = {
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+ 0xaa, 0x73, 0xee, 0x55,
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+ 0xdb, 0xbd, 0x5e, 0xe3,
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+};
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+
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+static int qcom_smem_get_flash_blksz(u64 **smem_blksz)
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+{
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+ int ret;
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+ size_t size;
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+
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+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_BOOT_FLASH_BLOCK_SIZE,
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+ (void **) smem_blksz, &size);
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+
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+ if (ret < 0) {
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+ pr_err("Unable to read flash blksz from SMEM\n");
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+ return -ENOENT;
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+ }
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+
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+ if (size != sizeof(**smem_blksz)) {
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+ pr_err("Invalid flash blksz size in SMEM\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int qcom_smem_get_flash_type(u64 **smem_flash_type)
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+{
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+ int ret;
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+ size_t size;
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+
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+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_BOOT_FLASH_TYPE,
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+ (void **) smem_flash_type, &size);
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+
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+ if (ret < 0) {
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+ pr_err("Unable to read flash type from SMEM\n");
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+ return -ENOENT;
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+ }
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+
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+ if (size != sizeof(**smem_flash_type)) {
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+ pr_err("Invalid flash type size in SMEM\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int qcom_smem_get_flash_partitions(struct smem_partition_table **pparts)
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+{
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+ int ret;
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+ size_t size;
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+
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+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_AARM_PARTITION_TABLE,
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+ (void **) pparts, &size);
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+
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+ if (ret < 0) {
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+ pr_err("Unable to read partition table from SMEM\n");
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+ return -ENOENT;
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+ }
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+
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+ return 0;
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+}
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+
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+static int of_dev_node_match(struct device *dev, void *data)
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+{
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+ return dev->of_node == data;
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+}
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+
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+static bool is_spi_device(struct device_node *np)
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+{
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+ struct device *dev;
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+
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+ dev = bus_find_device(&spi_bus_type, NULL, np, of_dev_node_match);
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+ if (!dev)
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+ return false;
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+
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+ put_device(dev);
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+ return true;
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+}
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+
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+static int parse_qcom_smem_partitions(struct mtd_info *master,
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+ struct mtd_partition **pparts,
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+ struct mtd_part_parser_data *data)
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+{
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+ struct smem_partition_table *smem_parts;
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+ u64 *smem_flash_type, *smem_blksz;
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+ struct mtd_partition *mtd_parts;
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+ struct device_node *of_node = data->of_node;
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+ int i, ret;
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+
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+ /*
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+ * SMEM will only store the partition table of the boot device.
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+ * If this is not the boot device, do not return any partition.
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+ */
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+ ret = qcom_smem_get_flash_type(&smem_flash_type);
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+ if (ret < 0)
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+ return ret;
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+
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+ if ((*smem_flash_type == SMEM_FLASH_NAND && !mtd_type_is_nand(master))
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+ || (*smem_flash_type == SMEM_FLASH_SPI && !is_spi_device(of_node)))
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+ return 0;
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+
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+ /*
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+ * Just for sanity purpose, make sure the block size in SMEM matches the
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+ * block size of the MTD device
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+ */
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+ ret = qcom_smem_get_flash_blksz(&smem_blksz);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (*smem_blksz != master->erasesize) {
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+ pr_err("SMEM block size differs from MTD block size\n");
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+ return -EINVAL;
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+ }
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+
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+ /* Get partition pointer from SMEM */
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+ ret = qcom_smem_get_flash_partitions(&smem_parts);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (memcmp(SMEM_PTABLE_MAGIC, smem_parts->magic,
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+ sizeof(SMEM_PTABLE_MAGIC))) {
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+ pr_err("SMEM partition magic invalid\n");
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+ return -EINVAL;
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+ }
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+
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+ /* Allocate and populate the mtd structures */
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+ mtd_parts = kcalloc(le32_to_cpu(smem_parts->len), sizeof(*mtd_parts),
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+ GFP_KERNEL);
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+ if (!mtd_parts)
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+ return -ENOMEM;
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+
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+ for (i = 0; i < smem_parts->len; i++) {
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+ struct smem_partition *s_part = &smem_parts->parts[i];
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+ struct mtd_partition *m_part = &mtd_parts[i];
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+
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+ m_part->name = s_part->name;
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+ m_part->size = le32_to_cpu(s_part->size) * (*smem_blksz);
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+ m_part->offset = le32_to_cpu(s_part->start) * (*smem_blksz);
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+
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+ /*
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+ * The last SMEM partition may have its size marked as
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+ * something like 0xffffffff, which means "until the end of the
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+ * flash device". In this case, truncate it.
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+ */
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+ if (m_part->offset + m_part->size > master->size)
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+ m_part->size = master->size - m_part->offset;
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+ }
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+
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+ *pparts = mtd_parts;
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+
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+ return smem_parts->len;
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+}
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+
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+static struct mtd_part_parser qcom_smem_parser = {
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+ .owner = THIS_MODULE,
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+ .parse_fn = parse_qcom_smem_partitions,
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+ .name = "qcom-smem",
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+};
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+
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+static int __init qcom_smem_parser_init(void)
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+{
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+ register_mtd_parser(&qcom_smem_parser);
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+ return 0;
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+}
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+
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+static void __exit qcom_smem_parser_exit(void)
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+{
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+ deregister_mtd_parser(&qcom_smem_parser);
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+}
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+
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+module_init(qcom_smem_parser_init);
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+module_exit(qcom_smem_parser_exit);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Mathieu Olivari <mathieu@codeaurora.org>");
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+MODULE_DESCRIPTION("Parsing code for SMEM based partition tables");
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--- a/drivers/mtd/Makefile
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+++ b/drivers/mtd/Makefile
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@@ -16,6 +16,7 @@ obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
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obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o
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obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
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obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
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+obj-$(CONFIG_MTD_QCOM_SMEM_PARTS) += qcom_smem_part.o
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# 'Users' - code which presents functionality to userspace.
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obj-$(CONFIG_MTD_BLKDEVS) += mtd_blkdevs.o
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@ -0,0 +1,277 @@
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From 0501f76b138cf1dc11a313bb7a094da524b79337 Mon Sep 17 00:00:00 2001
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From: Mathieu Olivari <mathieu@codeaurora.org>
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Date: Thu, 13 Aug 2015 09:53:14 -0700
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|
Subject: [PATCH 3/3] mtd: add SMEM parser for QCOM platforms
|
||||||
|
|
||||||
|
On QCOM platforms using MTD devices storage (such as IPQ806x), SMEM is
|
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used to store partition layout. This new parser can now be used to read
|
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|
SMEM and use it to register an MTD layout according to its content.
|
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|
|
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Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
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---
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drivers/mtd/Kconfig | 7 ++
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drivers/mtd/Makefile | 1 +
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drivers/mtd/qcom_smem_part.c | 231 +++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 239 insertions(+)
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create mode 100644 drivers/mtd/qcom_smem_part.c
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -200,6 +200,13 @@ config MTD_MYLOADER_PARTS
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You will still need the parsing functions to be called by the driver
|
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for your particular device. It won't happen automatically.
|
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|
|
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+config MTD_QCOM_SMEM_PARTS
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+ tristate "QCOM SMEM partitioning support"
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+ depends on QCOM_SMEM
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|
+ help
|
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|
+ This provides partitions parser for QCOM devices using SMEM
|
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|
+ such as IPQ806x.
|
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+
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comment "User Modules And Translation Layers"
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|
|
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#
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--- /dev/null
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+++ b/drivers/mtd/qcom_smem_part.c
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@@ -0,0 +1,231 @@
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+/*
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+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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|
+ * GNU General Public License for more details.
|
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|
+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/device.h>
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+#include <linux/slab.h>
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+
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+#include <linux/mtd/mtd.h>
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+#include <linux/mtd/partitions.h>
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+#include <linux/spi/spi.h>
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+#include <linux/module.h>
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+
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+#include <linux/soc/qcom/smem.h>
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+
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+/* Processor/host identifier for the application processor */
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+#define SMEM_HOST_APPS 0
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+
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+/* SMEM items index */
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+#define SMEM_AARM_PARTITION_TABLE 9
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+#define SMEM_BOOT_FLASH_TYPE 421
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+#define SMEM_BOOT_FLASH_BLOCK_SIZE 424
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+
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+/* SMEM Flash types */
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+#define SMEM_FLASH_NAND 2
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+#define SMEM_FLASH_SPI 6
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+
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+#define SMEM_PART_NAME_SZ 16
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+#define SMEM_PARTS_MAX 32
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+
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+struct smem_partition {
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+ char name[SMEM_PART_NAME_SZ];
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+ __le32 start;
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||||||
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+ __le32 size;
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||||||
|
+ __le32 attr;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct smem_partition_table {
|
||||||
|
+ u8 magic[8];
|
||||||
|
+ __le32 version;
|
||||||
|
+ __le32 len;
|
||||||
|
+ struct smem_partition parts[SMEM_PARTS_MAX];
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+/* SMEM Magic values in partition table */
|
||||||
|
+static const u8 SMEM_PTABLE_MAGIC[] = {
|
||||||
|
+ 0xaa, 0x73, 0xee, 0x55,
|
||||||
|
+ 0xdb, 0xbd, 0x5e, 0xe3,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static int qcom_smem_get_flash_blksz(u64 **smem_blksz)
|
||||||
|
+{
|
||||||
|
+ int ret;
|
||||||
|
+ size_t size;
|
||||||
|
+
|
||||||
|
+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_BOOT_FLASH_BLOCK_SIZE,
|
||||||
|
+ (void **) smem_blksz, &size);
|
||||||
|
+
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ pr_err("Unable to read flash blksz from SMEM\n");
|
||||||
|
+ return -ENOENT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (size != sizeof(**smem_blksz)) {
|
||||||
|
+ pr_err("Invalid flash blksz size in SMEM\n");
|
||||||
|
+ return -EINVAL;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int qcom_smem_get_flash_type(u64 **smem_flash_type)
|
||||||
|
+{
|
||||||
|
+ int ret;
|
||||||
|
+ size_t size;
|
||||||
|
+
|
||||||
|
+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_BOOT_FLASH_TYPE,
|
||||||
|
+ (void **) smem_flash_type, &size);
|
||||||
|
+
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ pr_err("Unable to read flash type from SMEM\n");
|
||||||
|
+ return -ENOENT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (size != sizeof(**smem_flash_type)) {
|
||||||
|
+ pr_err("Invalid flash type size in SMEM\n");
|
||||||
|
+ return -EINVAL;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int qcom_smem_get_flash_partitions(struct smem_partition_table **pparts)
|
||||||
|
+{
|
||||||
|
+ int ret;
|
||||||
|
+ size_t size;
|
||||||
|
+
|
||||||
|
+ ret = qcom_smem_get(SMEM_HOST_APPS, SMEM_AARM_PARTITION_TABLE,
|
||||||
|
+ (void **) pparts, &size);
|
||||||
|
+
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ pr_err("Unable to read partition table from SMEM\n");
|
||||||
|
+ return -ENOENT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int of_dev_node_match(struct device *dev, void *data)
|
||||||
|
+{
|
||||||
|
+ return dev->of_node == data;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static bool is_spi_device(struct device_node *np)
|
||||||
|
+{
|
||||||
|
+ struct device *dev;
|
||||||
|
+
|
||||||
|
+ dev = bus_find_device(&spi_bus_type, NULL, np, of_dev_node_match);
|
||||||
|
+ if (!dev)
|
||||||
|
+ return false;
|
||||||
|
+
|
||||||
|
+ put_device(dev);
|
||||||
|
+ return true;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int parse_qcom_smem_partitions(struct mtd_info *master,
|
||||||
|
+ struct mtd_partition **pparts,
|
||||||
|
+ struct mtd_part_parser_data *data)
|
||||||
|
+{
|
||||||
|
+ struct smem_partition_table *smem_parts;
|
||||||
|
+ u64 *smem_flash_type, *smem_blksz;
|
||||||
|
+ struct mtd_partition *mtd_parts;
|
||||||
|
+ struct device_node *of_node = data->of_node;
|
||||||
|
+ int i, ret;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * SMEM will only store the partition table of the boot device.
|
||||||
|
+ * If this is not the boot device, do not return any partition.
|
||||||
|
+ */
|
||||||
|
+ ret = qcom_smem_get_flash_type(&smem_flash_type);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ if ((*smem_flash_type == SMEM_FLASH_NAND && !mtd_type_is_nand(master))
|
||||||
|
+ || (*smem_flash_type == SMEM_FLASH_SPI && !is_spi_device(of_node)))
|
||||||
|
+ return 0;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * Just for sanity purpose, make sure the block size in SMEM matches the
|
||||||
|
+ * block size of the MTD device
|
||||||
|
+ */
|
||||||
|
+ ret = qcom_smem_get_flash_blksz(&smem_blksz);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ if (*smem_blksz != master->erasesize) {
|
||||||
|
+ pr_err("SMEM block size differs from MTD block size\n");
|
||||||
|
+ return -EINVAL;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* Get partition pointer from SMEM */
|
||||||
|
+ ret = qcom_smem_get_flash_partitions(&smem_parts);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ if (memcmp(SMEM_PTABLE_MAGIC, smem_parts->magic,
|
||||||
|
+ sizeof(SMEM_PTABLE_MAGIC))) {
|
||||||
|
+ pr_err("SMEM partition magic invalid\n");
|
||||||
|
+ return -EINVAL;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* Allocate and populate the mtd structures */
|
||||||
|
+ mtd_parts = kcalloc(le32_to_cpu(smem_parts->len), sizeof(*mtd_parts),
|
||||||
|
+ GFP_KERNEL);
|
||||||
|
+ if (!mtd_parts)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < smem_parts->len; i++) {
|
||||||
|
+ struct smem_partition *s_part = &smem_parts->parts[i];
|
||||||
|
+ struct mtd_partition *m_part = &mtd_parts[i];
|
||||||
|
+
|
||||||
|
+ m_part->name = s_part->name;
|
||||||
|
+ m_part->size = le32_to_cpu(s_part->size) * (*smem_blksz);
|
||||||
|
+ m_part->offset = le32_to_cpu(s_part->start) * (*smem_blksz);
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * The last SMEM partition may have its size marked as
|
||||||
|
+ * something like 0xffffffff, which means "until the end of the
|
||||||
|
+ * flash device". In this case, truncate it.
|
||||||
|
+ */
|
||||||
|
+ if (m_part->offset + m_part->size > master->size)
|
||||||
|
+ m_part->size = master->size - m_part->offset;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ *pparts = mtd_parts;
|
||||||
|
+
|
||||||
|
+ return smem_parts->len;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static struct mtd_part_parser qcom_smem_parser = {
|
||||||
|
+ .owner = THIS_MODULE,
|
||||||
|
+ .parse_fn = parse_qcom_smem_partitions,
|
||||||
|
+ .name = "qcom-smem",
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static int __init qcom_smem_parser_init(void)
|
||||||
|
+{
|
||||||
|
+ register_mtd_parser(&qcom_smem_parser);
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void __exit qcom_smem_parser_exit(void)
|
||||||
|
+{
|
||||||
|
+ deregister_mtd_parser(&qcom_smem_parser);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+module_init(qcom_smem_parser_init);
|
||||||
|
+module_exit(qcom_smem_parser_exit);
|
||||||
|
+
|
||||||
|
+MODULE_LICENSE("GPL");
|
||||||
|
+MODULE_AUTHOR("Mathieu Olivari <mathieu@codeaurora.org>");
|
||||||
|
+MODULE_DESCRIPTION("Parsing code for SMEM based partition tables");
|
||||||
|
--- a/drivers/mtd/Makefile
|
||||||
|
+++ b/drivers/mtd/Makefile
|
||||||
|
@@ -16,6 +16,7 @@ obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
|
||||||
|
obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o
|
||||||
|
obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
|
||||||
|
obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
|
||||||
|
+obj-$(CONFIG_MTD_QCOM_SMEM_PARTS) += qcom_smem_part.o
|
||||||
|
|
||||||
|
# 'Users' - code which presents functionality to userspace.
|
||||||
|
obj-$(CONFIG_MTD_BLKDEVS) += mtd_blkdevs.o
|
||||||
Loading…
Reference in New Issue
Block a user