2018-04-11 01:57:23 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2020-10-01 23:41:44 +08:00
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/* Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved. */
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2018-04-11 01:57:23 +08:00
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2020-03-10 02:57:04 +08:00
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#include <linux/debugfs.h>
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2018-04-11 01:57:23 +08:00
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#include <linux/kernel.h>
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2020-10-01 23:41:44 +08:00
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#include <linux/module.h>
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2018-04-11 01:57:23 +08:00
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/platform_device.h>
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2020-03-10 02:57:04 +08:00
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#include <linux/seq_file.h>
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2018-04-11 01:57:23 +08:00
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#include <linux/types.h>
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#include <soc/qcom/cmd-db.h>
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#define NUM_PRIORITY 2
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#define MAX_SLV_ID 8
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#define SLAVE_ID_MASK 0x7
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#define SLAVE_ID_SHIFT 16
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/**
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* struct entry_header: header for each entry in cmddb
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*
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* @id: resource's identifier
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* @priority: unused
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* @addr: the address of the resource
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* @len: length of the data
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* @offset: offset from :@data_offset, start of the data
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*/
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struct entry_header {
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2018-04-20 02:29:24 +08:00
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u8 id[8];
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__le32 priority[NUM_PRIORITY];
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__le32 addr;
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__le16 len;
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__le16 offset;
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2018-04-11 01:57:23 +08:00
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};
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/**
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* struct rsc_hdr: resource header information
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*
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* @slv_id: id for the resource
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* @header_offset: entry's header at offset from the end of the cmd_db_header
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* @data_offset: entry's data at offset from the end of the cmd_db_header
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* @cnt: number of entries for HW type
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* @version: MSB is major, LSB is minor
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* @reserved: reserved for future use.
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*/
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struct rsc_hdr {
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2018-04-20 02:29:24 +08:00
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__le16 slv_id;
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__le16 header_offset;
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__le16 data_offset;
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__le16 cnt;
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__le16 version;
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__le16 reserved[3];
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2018-04-11 01:57:23 +08:00
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};
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/**
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* struct cmd_db_header: The DB header information
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*
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* @version: The cmd db version
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2018-04-20 02:29:24 +08:00
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* @magic: constant expected in the database
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2018-04-11 01:57:23 +08:00
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* @header: array of resources
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* @checksum: checksum for the header. Unused.
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* @reserved: reserved memory
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* @data: driver specific data
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*/
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struct cmd_db_header {
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2018-04-20 02:29:24 +08:00
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__le32 version;
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u8 magic[4];
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2018-04-11 01:57:23 +08:00
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struct rsc_hdr header[MAX_SLV_ID];
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2018-04-20 02:29:24 +08:00
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__le32 checksum;
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__le32 reserved;
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2018-04-11 01:57:23 +08:00
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u8 data[];
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};
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/**
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* DOC: Description of the Command DB database.
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*
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* At the start of the command DB memory is the cmd_db_header structure.
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* The cmd_db_header holds the version, checksum, magic key as well as an
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* array for header for each slave (depicted by the rsc_header). Each h/w
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* based accelerator is a 'slave' (shared resource) and has slave id indicating
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* the type of accelerator. The rsc_header is the header for such individual
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* slaves of a given type. The entries for each of these slaves begin at the
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* rsc_hdr.header_offset. In addition each slave could have auxiliary data
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* that may be needed by the driver. The data for the slave starts at the
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* entry_header.offset to the location pointed to by the rsc_hdr.data_offset.
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*
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* Drivers have a stringified key to a slave/resource. They can query the slave
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* information and get the slave id and the auxiliary data and the length of the
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* data. Using this information, they can format the request to be sent to the
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* h/w accelerator and request a resource state.
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*/
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2018-04-20 02:29:24 +08:00
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static const u8 CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c };
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static bool cmd_db_magic_matches(const struct cmd_db_header *header)
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{
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const u8 *magic = header->magic;
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return memcmp(magic, CMD_DB_MAGIC, ARRAY_SIZE(CMD_DB_MAGIC)) == 0;
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}
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2018-04-11 01:57:23 +08:00
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static struct cmd_db_header *cmd_db_header;
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2018-09-27 02:02:33 +08:00
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static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr)
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2018-04-20 02:29:24 +08:00
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{
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u16 offset = le16_to_cpu(hdr->header_offset);
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return cmd_db_header->data + offset;
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}
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static inline void *
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2018-09-27 02:02:33 +08:00
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rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent)
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2018-04-20 02:29:24 +08:00
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{
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u16 offset = le16_to_cpu(hdr->data_offset);
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u16 loffset = le16_to_cpu(ent->offset);
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return cmd_db_header->data + offset + loffset;
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}
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2018-04-11 01:57:23 +08:00
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/**
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* cmd_db_ready - Indicates if command DB is available
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*
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* Return: 0 on success, errno otherwise
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*/
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int cmd_db_ready(void)
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{
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if (cmd_db_header == NULL)
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return -EPROBE_DEFER;
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2018-04-20 02:29:24 +08:00
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else if (!cmd_db_magic_matches(cmd_db_header))
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2018-04-11 01:57:23 +08:00
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL(cmd_db_ready);
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2018-09-27 02:02:33 +08:00
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static int cmd_db_get_header(const char *id, const struct entry_header **eh,
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const struct rsc_hdr **rh)
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2018-04-11 01:57:23 +08:00
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{
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2018-09-27 02:02:33 +08:00
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const struct rsc_hdr *rsc_hdr;
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const struct entry_header *ent;
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2018-04-11 01:57:23 +08:00
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int ret, i, j;
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2018-04-20 02:29:24 +08:00
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u8 query[8];
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2018-04-11 01:57:23 +08:00
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ret = cmd_db_ready();
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if (ret)
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return ret;
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2018-04-20 02:29:24 +08:00
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/* Pad out query string to same length as in DB */
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strncpy(query, id, sizeof(query));
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2018-04-11 01:57:23 +08:00
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for (i = 0; i < MAX_SLV_ID; i++) {
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rsc_hdr = &cmd_db_header->header[i];
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if (!rsc_hdr->slv_id)
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break;
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2018-04-20 02:29:24 +08:00
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ent = rsc_to_entry_header(rsc_hdr);
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for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
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2018-09-27 02:02:33 +08:00
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if (memcmp(ent->id, query, sizeof(ent->id)) == 0) {
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if (eh)
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*eh = ent;
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if (rh)
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*rh = rsc_hdr;
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return 0;
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}
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2018-04-11 01:57:23 +08:00
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}
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}
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return -ENODEV;
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}
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/**
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* cmd_db_read_addr() - Query command db for resource id address.
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*
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* @id: resource id to query for address
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*
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* Return: resource address on success, 0 on error
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*
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* This is used to retrieve resource address based on resource
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* id.
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*/
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u32 cmd_db_read_addr(const char *id)
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{
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int ret;
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2018-09-27 02:02:33 +08:00
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const struct entry_header *ent;
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:33 +08:00
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ret = cmd_db_get_header(id, &ent, NULL);
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:33 +08:00
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return ret < 0 ? 0 : le32_to_cpu(ent->addr);
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2018-04-11 01:57:23 +08:00
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}
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EXPORT_SYMBOL(cmd_db_read_addr);
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/**
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* cmd_db_read_aux_data() - Query command db for aux data.
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*
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2018-09-27 02:02:34 +08:00
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* @id: Resource to retrieve AUX Data on
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* @len: size of data buffer returned
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2018-04-11 01:57:23 +08:00
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*
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2018-09-27 02:02:34 +08:00
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* Return: pointer to data on success, error pointer otherwise
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2018-04-11 01:57:23 +08:00
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*/
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2018-09-27 02:02:34 +08:00
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const void *cmd_db_read_aux_data(const char *id, size_t *len)
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2018-04-11 01:57:23 +08:00
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{
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int ret;
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2018-09-27 02:02:33 +08:00
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const struct entry_header *ent;
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const struct rsc_hdr *rsc_hdr;
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2018-04-11 01:57:23 +08:00
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2018-04-20 02:29:24 +08:00
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ret = cmd_db_get_header(id, &ent, &rsc_hdr);
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2018-04-11 01:57:23 +08:00
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if (ret)
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2018-09-27 02:02:34 +08:00
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return ERR_PTR(ret);
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:34 +08:00
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if (len)
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*len = le16_to_cpu(ent->len);
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:34 +08:00
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return rsc_offset(rsc_hdr, ent);
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2018-04-11 01:57:23 +08:00
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}
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EXPORT_SYMBOL(cmd_db_read_aux_data);
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/**
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* cmd_db_read_slave_id - Get the slave ID for a given resource address
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*
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* @id: Resource id to query the DB for version
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*
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* Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
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*/
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enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
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{
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int ret;
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2018-09-27 02:02:33 +08:00
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const struct entry_header *ent;
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2018-04-20 02:29:24 +08:00
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u32 addr;
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:33 +08:00
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ret = cmd_db_get_header(id, &ent, NULL);
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2018-04-20 02:29:24 +08:00
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if (ret < 0)
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return CMD_DB_HW_INVALID;
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2018-04-11 01:57:23 +08:00
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2018-09-27 02:02:33 +08:00
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addr = le32_to_cpu(ent->addr);
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2018-04-20 02:29:24 +08:00
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return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
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2018-04-11 01:57:23 +08:00
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}
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EXPORT_SYMBOL(cmd_db_read_slave_id);
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2020-03-10 02:57:04 +08:00
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#ifdef CONFIG_DEBUG_FS
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static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
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{
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int i, j;
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const struct rsc_hdr *rsc;
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const struct entry_header *ent;
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const char *name;
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u16 len, version;
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u8 major, minor;
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seq_puts(seq, "Command DB DUMP\n");
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for (i = 0; i < MAX_SLV_ID; i++) {
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rsc = &cmd_db_header->header[i];
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if (!rsc->slv_id)
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break;
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2020-04-17 08:06:45 +08:00
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switch (le16_to_cpu(rsc->slv_id)) {
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2020-03-10 02:57:04 +08:00
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case CMD_DB_HW_ARC:
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name = "ARC";
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break;
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case CMD_DB_HW_VRM:
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name = "VRM";
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break;
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case CMD_DB_HW_BCM:
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name = "BCM";
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break;
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default:
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name = "Unknown";
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break;
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}
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version = le16_to_cpu(rsc->version);
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major = version >> 8;
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minor = version;
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seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor);
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seq_puts(seq, "-------------------------\n");
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ent = rsc_to_entry_header(rsc);
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for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) {
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2020-04-16 03:29:16 +08:00
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seq_printf(seq, "0x%05x: %*pEp", le32_to_cpu(ent->addr),
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2020-04-15 14:20:33 +08:00
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(int)sizeof(ent->id), ent->id);
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2020-03-10 02:57:04 +08:00
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len = le16_to_cpu(ent->len);
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if (len) {
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seq_printf(seq, " [%*ph]",
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len, rsc_offset(rsc, ent));
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}
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seq_putc(seq, '\n');
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}
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}
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return 0;
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}
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static int open_cmd_db_debugfs(struct inode *inode, struct file *file)
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{
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return single_open(file, cmd_db_debugfs_dump, inode->i_private);
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}
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#endif
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static const struct file_operations cmd_db_debugfs_ops = {
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#ifdef CONFIG_DEBUG_FS
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.open = open_cmd_db_debugfs,
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#endif
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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2018-04-11 01:57:23 +08:00
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static int cmd_db_dev_probe(struct platform_device *pdev)
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{
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struct reserved_mem *rmem;
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int ret = 0;
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rmem = of_reserved_mem_lookup(pdev->dev.of_node);
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if (!rmem) {
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dev_err(&pdev->dev, "failed to acquire memory region\n");
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return -EINVAL;
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}
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cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
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2019-02-28 13:48:49 +08:00
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if (!cmd_db_header) {
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ret = -ENOMEM;
|
2018-04-11 01:57:23 +08:00
|
|
|
cmd_db_header = NULL;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2018-04-20 02:29:24 +08:00
|
|
|
if (!cmd_db_magic_matches(cmd_db_header)) {
|
2018-04-11 01:57:23 +08:00
|
|
|
dev_err(&pdev->dev, "Invalid Command DB Magic\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2020-03-10 02:57:04 +08:00
|
|
|
debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops);
|
|
|
|
|
2018-04-11 01:57:23 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id cmd_db_match_table[] = {
|
|
|
|
{ .compatible = "qcom,cmd-db" },
|
2020-03-10 02:57:04 +08:00
|
|
|
{ }
|
2018-04-11 01:57:23 +08:00
|
|
|
};
|
2020-10-01 23:41:44 +08:00
|
|
|
MODULE_DEVICE_TABLE(of, cmd_db_match_table);
|
2018-04-11 01:57:23 +08:00
|
|
|
|
|
|
|
static struct platform_driver cmd_db_dev_driver = {
|
|
|
|
.probe = cmd_db_dev_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = "cmd-db",
|
|
|
|
.of_match_table = cmd_db_match_table,
|
2020-10-01 23:41:44 +08:00
|
|
|
.suppress_bind_attrs = true,
|
2018-04-11 01:57:23 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init cmd_db_device_init(void)
|
|
|
|
{
|
|
|
|
return platform_driver_register(&cmd_db_dev_driver);
|
|
|
|
}
|
|
|
|
arch_initcall(cmd_db_device_init);
|
2020-10-01 23:41:44 +08:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Command DB Driver");
|
|
|
|
MODULE_LICENSE("GPL v2");
|