@@ -494,6 +494,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
#ifndef CONFIG_PPC
static const struct of_device_id reserved_mem_matches[] = {
{ .compatible = "qcom,rmtfs-mem" },
+ { .compatible = "qcom,cmd-db" },
{ .compatible = "ramoops" },
{}
};
@@ -3,6 +3,15 @@
#
menu "Qualcomm SoC drivers"
+config QCOM_COMMAND_DB
+ bool "Qualcomm Command DB"
+ depends on (ARCH_QCOM && OF) || COMPILE_TEST
+ help
+ Command DB queries shared memory by key string for shared system
+ resources. Platform drivers that require to set state of a shared
+ resource on a RPM-hardened platform must use this database to get
+ SoC specific identifier and information for the shared resources.
+
config QCOM_GLINK_SSR
tristate "Qualcomm Glink SSR driver"
depends on RPMSG
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
new file mode 100644
@@ -0,0 +1,310 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <soc/qcom/cmd-db.h>
+
+#define NUM_PRIORITY 2
+#define MAX_SLV_ID 8
+#define CMD_DB_MAGIC 0x0C0330DBUL
+#define SLAVE_ID_MASK 0x7
+#define SLAVE_ID_SHIFT 16
+
+#define ENTRY_HEADER(hdr) ((void *)cmd_db_header + \
+ sizeof(*cmd_db_header) + \
+ hdr->header_offset)
+
+#define RSC_OFFSET(hdr, ent) ((void *)cmd_db_header + \
+ sizeof(*cmd_db_header) + \
+ hdr.data_offset + ent.offset)
+
+/**
+ * struct entry_header: header for each entry in cmddb
+ *
+ * @id: resource's identifier
+ * @priority: unused
+ * @addr: the address of the resource
+ * @len: length of the data
+ * @offset: offset from :@data_offset, start of the data
+ */
+struct entry_header {
+ u64 id;
+ u32 priority[NUM_PRIORITY];
+ u32 addr;
+ u16 len;
+ u16 offset;
+};
+
+/**
+ * struct rsc_hdr: resource header information
+ *
+ * @slv_id: id for the resource
+ * @header_offset: entry's header at offset from the end of the cmd_db_header
+ * @data_offset: entry's data at offset from the end of the cmd_db_header
+ * @cnt: number of entries for HW type
+ * @version: MSB is major, LSB is minor
+ * @reserved: reserved for future use.
+ */
+struct rsc_hdr {
+ u16 slv_id;
+ u16 header_offset;
+ u16 data_offset;
+ u16 cnt;
+ u16 version;
+ u16 reserved[3];
+};
+
+/**
+ * struct cmd_db_header: The DB header information
+ *
+ * @version: The cmd db version
+ * @magic_number: constant expected in the database
+ * @header: array of resources
+ * @checksum: checksum for the header. Unused.
+ * @reserved: reserved memory
+ * @data: driver specific data
+ */
+struct cmd_db_header {
+ u32 version;
+ u32 magic_num;
+ struct rsc_hdr header[MAX_SLV_ID];
+ u32 checksum;
+ u32 reserved;
+ u8 data[];
+};
+
+/**
+ * DOC: Description of the Command DB database.
+ *
+ * At the start of the command DB memory is the cmd_db_header structure.
+ * The cmd_db_header holds the version, checksum, magic key as well as an
+ * array for header for each slave (depicted by the rsc_header). Each h/w
+ * based accelerator is a 'slave' (shared resource) and has slave id indicating
+ * the type of accelerator. The rsc_header is the header for such individual
+ * slaves of a given type. The entries for each of these slaves begin at the
+ * rsc_hdr.header_offset. In addition each slave could have auxiliary data
+ * that may be needed by the driver. The data for the slave starts at the
+ * entry_header.offset to the location pointed to by the rsc_hdr.data_offset.
+ *
+ * Drivers have a stringified key to a slave/resource. They can query the slave
+ * information and get the slave id and the auxiliary data and the length of the
+ * data. Using this information, they can format the request to be sent to the
+ * h/w accelerator and request a resource state.
+ */
+
+static struct cmd_db_header *cmd_db_header;
+
+/**
+ * cmd_db_ready - Indicates if command DB is available
+ *
+ * Return: 0 on success, errno otherwise
+ */
+int cmd_db_ready(void)
+{
+ if (cmd_db_header == NULL)
+ return -EPROBE_DEFER;
+ else if (cmd_db_header->magic_num != CMD_DB_MAGIC)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL(cmd_db_ready);
+
+static u64 cmd_db_get_u64_id(const char *id)
+{
+ u64 rsc_id = 0;
+ u8 *ch = (u8 *)&rsc_id;
+
+ strncpy(ch, id, min(strlen(id), sizeof(rsc_id)));
+
+ return rsc_id;
+}
+
+static int cmd_db_get_header(u64 query, struct entry_header *eh,
+ struct rsc_hdr *rh)
+{
+ struct rsc_hdr *rsc_hdr;
+ struct entry_header *ent;
+ int ret, i, j;
+
+ ret = cmd_db_ready();
+ if (ret)
+ return ret;
+
+ if (!eh || !rh)
+ return -EINVAL;
+
+ for (i = 0; i < MAX_SLV_ID; i++) {
+ rsc_hdr = &cmd_db_header->header[i];
+ if (!rsc_hdr->slv_id)
+ break;
+
+ ent = ENTRY_HEADER(rsc_hdr);
+ for (j = 0; j < rsc_hdr->cnt; j++, ent++) {
+ if (ent->id == query)
+ break;
+ }
+
+ if (j < rsc_hdr->cnt) {
+ memcpy(eh, ent, sizeof(*ent));
+ memcpy(rh, rsc_hdr, sizeof(*rh));
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+static int cmd_db_get_header_by_rsc_id(const char *id,
+ struct entry_header *ent_hdr,
+ struct rsc_hdr *rsc_hdr)
+{
+ u64 rsc_id = cmd_db_get_u64_id(id);
+
+ return cmd_db_get_header(rsc_id, ent_hdr, rsc_hdr);
+}
+
+/**
+ * cmd_db_read_addr() - Query command db for resource id address.
+ *
+ * @id: resource id to query for address
+ *
+ * Return: resource address on success, 0 on error
+ *
+ * This is used to retrieve resource address based on resource
+ * id.
+ */
+u32 cmd_db_read_addr(const char *id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
+
+ return ret < 0 ? 0 : ent.addr;
+}
+EXPORT_SYMBOL(cmd_db_read_addr);
+
+/**
+ * cmd_db_read_aux_data() - Query command db for aux data.
+ *
+ * @id: Resource to retrieve AUX Data on.
+ * @data: Data buffer to copy returned aux data to. Returns size on NULL
+ * @len: Caller provides size of data buffer passed in.
+ *
+ * Return: size of data on success, errno otherwise
+ */
+int cmd_db_read_aux_data(const char *id, u8 *data, size_t len)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ if (!data)
+ return -EINVAL;
+
+ ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
+ if (ret)
+ return ret;
+
+ if (len < ent.len)
+ return -EINVAL;
+
+ len = min_t(u16, ent.len, len);
+ memcpy(data, RSC_OFFSET(rsc_hdr, ent), len);
+
+ return len;
+}
+EXPORT_SYMBOL(cmd_db_read_aux_data);
+
+/**
+ * cmd_db_read_aux_data_len - Get the length of the auxiliary data stored in DB.
+ *
+ * @id: Resource to retrieve AUX Data.
+ *
+ * Return: size on success, 0 on error
+ */
+size_t cmd_db_read_aux_data_len(const char *id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
+
+ return ret < 0 ? 0 : ent.len;
+}
+EXPORT_SYMBOL(cmd_db_read_aux_data_len);
+
+/**
+ * cmd_db_read_slave_id - Get the slave ID for a given resource address
+ *
+ * @id: Resource id to query the DB for version
+ *
+ * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
+ */
+enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
+
+ return ret < 0 ? CMD_DB_HW_INVALID :
+ (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
+}
+EXPORT_SYMBOL(cmd_db_read_slave_id);
+
+static int cmd_db_dev_probe(struct platform_device *pdev)
+{
+ struct reserved_mem *rmem;
+ int ret = 0;
+
+ rmem = of_reserved_mem_lookup(pdev->dev.of_node);
+ if (!rmem) {
+ dev_err(&pdev->dev, "failed to acquire memory region\n");
+ return -EINVAL;
+ }
+
+ cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
+ if (IS_ERR_OR_NULL(cmd_db_header)) {
+ ret = PTR_ERR(cmd_db_header);
+ cmd_db_header = NULL;
+ return ret;
+ }
+
+ if (cmd_db_header->magic_num != CMD_DB_MAGIC) {
+ dev_err(&pdev->dev, "Invalid Command DB Magic\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id cmd_db_match_table[] = {
+ { .compatible = "qcom,cmd-db" },
+ { },
+};
+
+static struct platform_driver cmd_db_dev_driver = {
+ .probe = cmd_db_dev_probe,
+ .driver = {
+ .name = "cmd-db",
+ .of_match_table = cmd_db_match_table,
+ },
+};
+
+static int __init cmd_db_device_init(void)
+{
+ return platform_driver_register(&cmd_db_dev_driver);
+}
+arch_initcall(cmd_db_device_init);
new file mode 100644
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
+
+#ifndef __QCOM_COMMAND_DB_H__
+#define __QCOM_COMMAND_DB_H__
+
+
+enum cmd_db_hw_type {
+ CMD_DB_HW_INVALID = 0,
+ CMD_DB_HW_MIN = 3,
+ CMD_DB_HW_ARC = CMD_DB_HW_MIN,
+ CMD_DB_HW_VRM = 4,
+ CMD_DB_HW_BCM = 5,
+ CMD_DB_HW_MAX = CMD_DB_HW_BCM,
+ CMD_DB_HW_ALL = 0xff,
+};
+
+#if IS_ENABLED(CONFIG_QCOM_COMMAND_DB)
+u32 cmd_db_read_addr(const char *resource_id);
+
+int cmd_db_read_aux_data(const char *resource_id, u8 *data, size_t len);
+
+size_t cmd_db_read_aux_data_len(const char *resource_id);
+
+enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
+
+int cmd_db_ready(void);
+#else
+static inline u32 cmd_db_read_addr(const char *resource_id)
+{ return 0; }
+
+static inline int cmd_db_read_aux_data(const char *resource_id, u8 *data,
+ size_t len)
+{ return -ENODEV; }
+
+static inline size_t cmd_db_read_aux_data_len(const char *resource_id)
+{ return -ENODEV; }
+
+static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id)
+{ return -ENODEV; }
+
+static inline int cmd_db_ready(void)
+{ return -ENODEV; }
+#endif /* CONFIG_QCOM_COMMAND_DB */
+#endif /* __QCOM_COMMAND_DB_H__ */