0/2] drivers/qcom: add Command DB support

index c00d81dfac0b..26fb43847f4b 100644
@@ -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" },
 	{}
 };

310 lines not on this page · raw message

45 lines not on this page · raw message

index b5172049f608..a56dc9edab82 100644
@@ -13,18 +13,10 @@
 
 #define NUM_PRIORITY		2
 #define MAX_SLV_ID		8
-#define CMD_DB_MAGIC		0x0C0330DBUL
+static const char CMD_DB_MAGIC[] = { 0xdb, 0x33, 0x03, 0x0c };
 #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
  *

@@ -35,11 +27,11 @@
  * @offset: offset from :@data_offset, start of the data
  */
 struct entry_header {
-	u64 id;
-	u32 priority[NUM_PRIORITY];
-	u32 addr;
-	u16 len;
-	u16 offset;
+	u8 id[8];
+	__le32 priority[NUM_PRIORITY];
+	__le32 addr;
+	__le16 len;
+	__le16 offset;
 };
 
 /**

@@ -53,12 +45,12 @@ struct entry_header {
  * @reserved: reserved for future use.
  */
 struct rsc_hdr {
-	u16 slv_id;
-	u16 header_offset;
-	u16 data_offset;
-	u16 cnt;
-	u16 version;
-	u16 reserved[3];
+	__le16 slv_id;
+	__le16 header_offset;
+	__le16 data_offset;
+	__le16 cnt;
+	__le16 version;
+	__le16 reserved[3];
 };
 
 /**

@@ -72,11 +64,11 @@ struct rsc_hdr {
  * @data: driver specific data
  */
 struct cmd_db_header {
-	u32 version;
-	u32 magic_num;
+	__le32 version;
+	__le32 magic_num;
 	struct rsc_hdr header[MAX_SLV_ID];
-	u32 checksum;
-	u32 reserved;
+	__le32 checksum;
+	__le32 reserved;
 	u8 data[];
 };
 

@@ -101,6 +93,22 @@ struct cmd_db_header {
 
 static struct cmd_db_header *cmd_db_header;
 
+static inline void *rsc_to_entry_header(struct rsc_hdr *hdr)
+{
+	u16 offset = le16_to_cpu(hdr->header_offset);
+
+	return cmd_db_header->data + offset;
+}
+
+static inline void *
+rsc_offset(struct rsc_hdr *hdr, struct entry_header *ent)
+{
+	u16 offset = le16_to_cpu(hdr->header_offset);
+	u16 loffset = le16_to_cpu(ent->offset);
+
+	return cmd_db_header->data + offset +  loffset;
+}
+
 /**
  * cmd_db_ready - Indicates if command DB is available
  *

@@ -110,29 +118,20 @@ int cmd_db_ready(void)
 {
 	if (cmd_db_header == NULL)
 		return -EPROBE_DEFER;
-	else if (cmd_db_header->magic_num != CMD_DB_MAGIC)
+	else if (memcmp(&cmd_db_header->magic_num, CMD_DB_MAGIC, sizeof(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,
+static int cmd_db_get_header(const char *id, struct entry_header *eh,
 			     struct rsc_hdr *rh)
 {
 	struct rsc_hdr *rsc_hdr;
 	struct entry_header *ent;
 	int ret, i, j;
+	char query[8];
 
 	ret = cmd_db_ready();
 	if (ret)

@@ -141,18 +140,21 @@ static int cmd_db_get_header(u64 query, struct entry_header *eh,
 	if (!eh || !rh)
 		return -EINVAL;
 
+	/* Pad out query string to same length as in DB */
+	strncpy(query, id, sizeof(query));
+
 	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)
+		ent = rsc_to_entry_header(rsc_hdr);
+		for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
+			if (memcmp(ent->id, query, sizeof(ent->id)))
 				break;
 		}
 
-		if (j < rsc_hdr->cnt) {
+		if (j < le16_to_cpu(rsc_hdr->cnt)) {
 			memcpy(eh, ent, sizeof(*ent));
 			memcpy(rh, rsc_hdr, sizeof(*rh));
 			return 0;

@@ -166,9 +168,7 @@ 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);
+	return cmd_db_get_header(id, ent_hdr, rsc_hdr);
 }
 
 /**

@@ -189,7 +189,7 @@ u32 cmd_db_read_addr(const char *id)
 
 	ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
 
-	return ret < 0 ? 0 : ent.addr;
+	return ret < 0 ? 0 : le32_to_cpu(ent.addr);
 }
 EXPORT_SYMBOL(cmd_db_read_addr);
 

@@ -207,6 +207,7 @@ 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;
+	u16 ent_len;
 
 	if (!data)
 		return -EINVAL;

@@ -215,11 +216,12 @@ int cmd_db_read_aux_data(const char *id, u8 *data, size_t len)
 	if (ret)
 		return ret;
 
-	if (len < ent.len)
+	ent_len = le16_to_cpu(ent.len);
+	if (len < ent_len)
 		return -EINVAL;
 
-	len = min_t(u16, ent.len, len);
-	memcpy(data, RSC_OFFSET(rsc_hdr, ent), len);
+	len = min_t(u16, ent_len, len);
+	memcpy(data, rsc_offset(&rsc_hdr, &ent), len);
 
 	return len;
 }

@@ -240,7 +242,7 @@ size_t cmd_db_read_aux_data_len(const char *id)
 
 	ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
 
-	return ret < 0 ? 0 : ent.len;
+	return ret < 0 ? 0 : le16_to_cpu(ent.len);
 }
 EXPORT_SYMBOL(cmd_db_read_aux_data_len);
 

@@ -256,11 +258,14 @@ enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;
+	u32 addr;
 
 	ret = cmd_db_get_header_by_rsc_id(id, &ent, &rsc_hdr);
+	if (ret < 0)
+		return CMD_DB_HW_INVALID;
 
-	return ret < 0 ? CMD_DB_HW_INVALID :
-		       (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
+	addr = le32_to_cpu(ent.addr);
+	return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
 }
 EXPORT_SYMBOL(cmd_db_read_slave_id);
 

@@ -282,7 +287,7 @@ static int cmd_db_dev_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	if (cmd_db_header->magic_num != CMD_DB_MAGIC) {
+	if (memcmp(&cmd_db_header->magic_num, CMD_DB_MAGIC, sizeof(CMD_DB_MAGIC))) {
 		dev_err(&pdev->dev, "Invalid Command DB Magic\n");
 		return -EINVAL;
 	}