From: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>
Command DB is a simple database in the shared memory of QCOM SoCs, that
provides information regarding shared resources. Some shared resources
in the SoC have properties that are probed dynamically at boot by the
remote processor. The information pertaining to the SoC and the platform
are made available in the shared memory. Drivers can query this
information using predefined strings.
Signed-off-by: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>
Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
---
drivers/soc/qcom/Kconfig | 7 ++
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/cmd-db.c | 306 ++++++++++++++++++++++++++++++++++++++++++++++
include/soc/qcom/cmd-db.h | 119 ++++++++++++++++++
4 files changed, 433 insertions(+)
create mode 100644 drivers/soc/qcom/cmd-db.c
create mode 100644 include/soc/qcom/cmd-db.h
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index b81374bb6713..f21c5d53e721 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -97,4 +97,11 @@ config QCOM_WCNSS_CTRL
Client driver for the WCNSS_CTRL SMD channel, used to download nv
firmware to a newly booted WCNSS chip.
+config QCOM_COMMAND_DB
+ bool "Qualcomm Command DB"
+ depends on ARCH_QCOM
+ help
+ Command DB queries shared memory by key string for shared system
+ resources
+
endmenu
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 40c56f67e94a..7b64135b22eb 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
+obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
new file mode 100644
index 000000000000..eb10ea8cf963
--- /dev/null
+++ b/drivers/soc/qcom/cmd-db.c
@@ -0,0 +1,306 @@
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <soc/qcom/cmd-db.h>
+
+#define RESOURCE_ID_LEN 8
+#define NUM_PRIORITY 2
+#define MAX_SLV_ID 8
+#define CMD_DB_MAGIC 0x0C0330DBUL
+#define SLAVE_ID_MASK 0x7
+#define SLAVE_ID_SHIFT 16
+
+/**
+ * entry_header: header for each entry in cmddb
+ *
+ * @res_id: resource's identifier
+ * @priority: unused
+ * @addr: the address of the resource
+ * @len: length of the data
+ * @offset: offset at which dats starts
+ */
+struct entry_header {
+ uint64_t res_id;
+ u32 priority[NUM_PRIORITY];
+ u32 addr;
+ u16 len;
+ u16 offset;
+};
+
+/**
+ * rsc_hdr: resource header information
+ *
+ * @slv_id: id for the resource
+ * @header_offset: Entry header offset from data
+ * @data_offset: Entry offset for datda location
+ * @cnt: number of enteries for HW type
+ * @version: MSB is major, LSB is minor
+ */
+struct rsc_hdr {
+ u16 slv_id;
+ u16 header_offset;
+ u16 data_offset;
+ u16 cnt;
+ u16 version;
+ u16 reserved[3];
+};
+
+/**
+ * cmd_db_header: The DB header information
+ *
+ * @version: The cmd db version
+ * @magic_number: constant expected in the database
+ * @header: array of resources
+ */
+struct cmd_db_header {
+ u32 version;
+ u32 magic_num;
+ struct rsc_hdr header[MAX_SLV_ID];
+ u32 check_sum;
+ u32 reserved;
+ u8 data[];
+};
+
+/**
+ * cmd_db_entry: Inforamtion for each line in the cmd db
+ *
+ * @resource_id: unique identifier for each entry
+ * @addr: slave id + offset address
+ * @priority: Bitmask for DRV ids
+ * @len: aux data len
+ * @data: data assocaited with the resource
+ */
+struct cmd_db_entry {
+ const char resource_id[RESOURCE_ID_LEN + 1];
+ const u32 addr;
+ const u32 priority[NUM_PRIORITY];
+ u32 len;
+ u16 version;
+ u8 data[];
+};
+
+static void __iomem *start_addr;
+static struct cmd_db_header *cmd_db_header;
+static int cmd_db_status = -EPROBE_DEFER;
+
+static u64 cmd_db_get_u64_id(const char *id)
+{
+ uint64_t rsc_id = 0;
+ uint8_t *ch = (uint8_t *)&rsc_id;
+ int i;
+
+ for (i = 0; ((i < sizeof(rsc_id)) && id[i]); i++)
+ ch[i] = id[i];
+
+ return rsc_id;
+}
+
+static int cmd_db_get_header(u64 query, struct entry_header *eh,
+ struct rsc_hdr *rh, bool use_addr)
+{
+ struct rsc_hdr *rsc_hdr;
+ int i, j;
+
+ if (!cmd_db_header)
+ return -EPROBE_DEFER;
+
+ if (!eh || !rh)
+ return -EINVAL;
+
+ rsc_hdr = &cmd_db_header->header[0];
+
+ for (i = 0; i < MAX_SLV_ID ; i++, rsc_hdr++) {
+ struct entry_header *ent;
+
+ if (!rsc_hdr->slv_id)
+ break;
+
+ ent = (struct entry_header *)(start_addr
+ + sizeof(*cmd_db_header)
+ + rsc_hdr->header_offset);
+
+ for (j = 0; j < rsc_hdr->cnt; j++, ent++) {
+ if (use_addr) {
+ if (ent->addr == (u32)(query))
+ break;
+ } else if (ent->res_id == query)
+ break;
+ }
+
+ if (j < rsc_hdr->cnt) {
+ memcpy(eh, ent, sizeof(*ent));
+ memcpy(rh, &cmd_db_header->header[i], sizeof(*rh));
+ return 0;
+ }
+ }
+ return -ENODEV;
+}
+
+static int cmd_db_get_header_by_rsc_id(const char *resource_id,
+ struct entry_header *ent_hdr,
+ struct rsc_hdr *rsc_hdr)
+{
+ u64 rsc_id = cmd_db_get_u64_id(resource_id);
+
+ return cmd_db_get_header(rsc_id, ent_hdr, rsc_hdr, false);
+}
+
+u32 cmd_db_get_addr(const char *resource_id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
+
+ return ret < 0 ? 0 : ent.addr;
+}
+EXPORT_SYMBOL(cmd_db_get_addr);
+
+int cmd_db_get_aux_data(const char *resource_id, u8 *data, int len)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ if (!data)
+ return -EINVAL;
+
+ ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
+
+ if (ret)
+ return ret;
+
+ if (ent.len < len)
+ return -EINVAL;
+
+ len = (ent.len < len) ? ent.len : len;
+
+ memcpy_fromio(data,
+ start_addr + sizeof(*cmd_db_header)
+ + rsc_hdr.data_offset + ent.offset,
+ len);
+ return len;
+}
+EXPORT_SYMBOL(cmd_db_get_aux_data);
+
+int cmd_db_get_aux_data_len(const char *resource_id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
+
+ return ret < 0 ? 0 : ent.len;
+}
+EXPORT_SYMBOL(cmd_db_get_aux_data_len);
+
+u16 cmd_db_get_version(const char *resource_id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
+ return ret < 0 ? 0 : rsc_hdr.version;
+}
+EXPORT_SYMBOL(cmd_db_get_version);
+
+int cmd_db_ready(void)
+{
+ return cmd_db_status;
+}
+EXPORT_SYMBOL(cmd_db_ready);
+
+int cmd_db_get_slave_id(const char *resource_id)
+{
+ int ret;
+ struct entry_header ent;
+ struct rsc_hdr rsc_hdr;
+
+ ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
+ return ret < 0 ? 0 : (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
+}
+EXPORT_SYMBOL(cmd_db_get_slave_id);
+
+static int cmd_db_dev_probe(struct platform_device *pdev)
+{
+ struct resource res;
+ void __iomem *dict;
+
+ dict = of_iomap(pdev->dev.of_node, 0);
+ if (!dict) {
+ cmd_db_status = -ENOMEM;
+ goto failed;
+ }
+
+ /*
+ * Read start address and size of the command DB address from
+ * shared dictionary location
+ */
+ res.start = readl_relaxed(dict);
+ res.end = res.start + readl_relaxed(dict + 0x4);
+ res.flags = IORESOURCE_MEM;
+ iounmap(dict);
+
+ start_addr = devm_ioremap_resource(&pdev->dev, &res);
+
+ cmd_db_header = devm_kzalloc(&pdev->dev,
+ sizeof(*cmd_db_header), GFP_KERNEL);
+
+ if (!cmd_db_header) {
+ cmd_db_status = -ENOMEM;
+ goto failed;
+ }
+
+ memcpy(cmd_db_header, start_addr, sizeof(*cmd_db_header));
+
+ if (cmd_db_header->magic_num != CMD_DB_MAGIC) {
+ pr_err("%s(): Invalid Magic\n", __func__);
+ cmd_db_status = -EINVAL;
+ goto failed;
+ }
+ cmd_db_status = 0;
+ of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+
+failed:
+ return cmd_db_status;
+}
+
+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",
+ .owner = THIS_MODULE,
+ .of_match_table = cmd_db_match_table,
+ },
+};
+
+int __init cmd_db_device_init(void)
+{
+ return platform_driver_register(&cmd_db_dev_driver);
+}
+arch_initcall(cmd_db_device_init);
diff --git a/include/soc/qcom/cmd-db.h b/include/soc/qcom/cmd-db.h
new file mode 100644
index 000000000000..1e42f7509cf9
--- /dev/null
+++ b/include/soc/qcom/cmd-db.h
@@ -0,0 +1,119 @@
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __QCOM_COMMAND_DB_H__
+#define __QCOM_COMMAND_DB_H__
+
+
+enum cmd_db_hw_type {
+ 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,
+};
+
+#ifdef CONFIG_QCOM_COMMAND_DB
+/**
+ * cmd_db_get_addr() - Query command db for resource id address.
+ *
+ * This is used to retrieve resource address based on resource
+ * id.
+ *
+ * @resource_id : resource id to query for address
+ *
+ * returns resource address on success or 0 on error otherwise
+ */
+u32 cmd_db_get_addr(const char *resource_id);
+
+/**
+ * cmd_db_get_aux_data() - Query command db for aux data. This is used to
+ * retrieve a command DB entry based resource address.
+ *
+ * @resource_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.
+ *
+ * returns size of data on success, errno on error
+ */
+int cmd_db_get_aux_data(const char *resource_id, u8 *data, int len);
+
+/**
+ * cmd_db_get_aux_data_len - Get the length of the auxllary data stored in DB.
+ *
+ * @resource_id: Resource to retrieve AUX Data.
+ *
+ * returns size on success, errno on error
+ */
+int cmd_db_get_aux_data_len(const char *resource_id);
+
+/**
+ * cmd_db_get_version - Get the version of the command DB data
+ *
+ * @resource_id: Resource id to query the DB for version
+ *
+ * returns version on success, 0 on error.
+ * Major number in MSB, minor number in LSB
+ */
+u16 cmd_db_get_version(const char *resource_id);
+
+/**
+ * cmd_db_ready - Indicates if command DB is probed
+ *
+ * returns 0 on success , errno otherwise
+ */
+int cmd_db_ready(void);
+
+/**
+ * cmd_db_get_slave_id - Get the slave ID for a given resource address
+ *
+ * @resource_id: Resource id to query the DB for version
+ *
+ * return cmd_db_hw_type enum on success, errno on error
+ */
+int cmd_db_get_slave_id(const char *resource_id);
+
+#else
+
+static inline u32 cmd_db_get_addr(const char *resource_id)
+{
+ return 0;
+}
+
+int cmd_db_get_aux_data(const char *resource_id, u8 *data, int len)
+{
+ return -ENODEV;
+}
+
+int cmd_db_get_aux_data_len(const char *resource_id)
+{
+ return -ENODEV;
+}
+
+u16 cmd_db_get_version(const char *resource_id)
+{
+ return 0;
+}
+
+int cmd_db_ready(void)
+{
+ return -ENODEV;
+}
+
+int cmd_db_get_slave_id(const char *resource_id)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_QCOM_COMMAND_DB */
+#endif /* __QCOM_COMMAND_DB_H__ */
--
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