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hwstub: add support for coprocessor operations

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At the moment the stub only implement them for MIPS.

Change-Id: Ica835a0e9c70fa5675c3d655eae986e812a47de8
This commit is contained in:
Amaury Pouly 2016-08-04 17:06:11 +01:00
parent d91d9f6851
commit 8fabbb008c
11 changed files with 423 additions and 17 deletions
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32
utils/hwstub/include/hwstub_protocol.h
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@ -33,7 +33,7 @@
*/
#define HWSTUB_VERSION_MAJOR 4
#define HWSTUB_VERSION_MINOR 2
#define HWSTUB_VERSION_MINOR 3
#define HWSTUB_VERSION__(maj, min) #maj"."#min
#define HWSTUB_VERSION_(maj, min) HWSTUB_VERSION__(maj, min)
@ -169,6 +169,7 @@ struct hwstub_net_hdr_t
#define HWSTUB_EXEC 0x44
#define HWSTUB_READ2_ATOMIC 0x45
#define HWSTUB_WRITE_ATOMIC 0x46
#define HWSTUB_COPROCESSOR_OP 0x47
/* the following commands and the ACK/NACK mechanism are net only */
#define HWSERVER_ACK(n) (0x100|(n))
@ -251,6 +252,35 @@ struct hwstub_exec_req_t
uint16_t bmFlags;
} __attribute__((packed));
/**
* HWSTUB_COPROCESSOR_OP
* Execute a coprocessor operation. The operation is describe in the header of
* the structure. There are currently two supported operations:
* - read: following the HWSTUB_COPROCESSOR_OP, the host can retrieve the data
* by sending a HWSTUB_READ2 request (just like a regular read) of
* the appropriate size
* - write: the header is followed by the data to write.
* If the request has two parts (second being READ2) then both requests must use
* the same ID in wValue, otherwise the second request will be STALLed.
* If a particular operation is not supported, it must be STALLed by the device.
*/
#define HWSTUB_COP_READ 0 /* read operation */
#define HWSTUB_COP_WRITE 1 /* write operation */
/* for MIPS */
#define HWSTUB_COP_MIPS_COP 0 /* coprocessor number */
#define HWSTUB_COP_MIPS_REG 1 /* coprocessor register */
#define HWSTUB_COP_MIPS_SEL 2 /* coprocessor select */
#define HWSTUB_COP_ARGS 7 /* maximum number of arguments */
struct hwstub_cop_req_t
{
uint8_t bOp; /* operation to execute */
uint8_t bArgs[HWSTUB_COP_ARGS]; /* arguments to the operation */
/* followed by data for WRITE operation */
};
/**
* HWSERVER_HELLO:
* Say hello to the server, give protocol version and get server version.