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platform/x86: ISST: Add Intel Speed Select mailbox interface via PCI

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Add an IOCTL to send mailbox commands to PUNIT using PUNIT PCI device.
A limited set of mailbox commands can be sent to PUNIT.

This MMIO interface is used by the intel-speed-select tool under
tools/x86/power to enumerate and control Intel Speed Select features.
The MBOX commands ids and semantics of the message can be checked from
the source code of the tool.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada
2019-06-26 15:38:47 -07:00
committed by Andy Shevchenko
parent d3a2358429
commit 31a166fe9c
5 changed files with 326 additions and 0 deletions
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38
include/uapi/linux/isst_if.h
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@@ -95,8 +95,46 @@ struct isst_if_io_regs {
struct isst_if_io_reg io_reg[1];
};
/**
* struct isst_if_mbox_cmd - Structure to define mail box command
* @logical_cpu: Logical CPU number to get target PCI device
* @parameter: Mailbox parameter value
* @req_data: Request data for the mailbox
* @resp_data: Response data for mailbox command response
* @command: Mailbox command value
* @sub_command: Mailbox sub command value
* @reserved: Unused, set to 0
*
* Structure to specify mailbox command to be sent to PUNIT.
*/
struct isst_if_mbox_cmd {
__u32 logical_cpu;
__u32 parameter;
__u32 req_data;
__u32 resp_data;
__u16 command;
__u16 sub_command;
__u32 reserved;
};
/**
* struct isst_if_mbox_cmds - structure for mailbox commands
* @cmd_count: Number of mailbox commands in mbox_cmd[]
* @mbox_cmd[]: Holds one or more mbox commands
*
* This structure used with ioctl ISST_IF_MBOX_COMMAND to send
* one or more mailbox commands to PUNIT. Here IOCTL return value
* indicates number of commands sent or error number if no commands have
* been sent.
*/
struct isst_if_mbox_cmds {
__u32 cmd_count;
struct isst_if_mbox_cmd mbox_cmd[1];
};
#define ISST_IF_MAGIC 0xFE
#define ISST_IF_GET_PLATFORM_INFO _IOR(ISST_IF_MAGIC, 0, struct isst_if_platform_info *)
#define ISST_IF_GET_PHY_ID _IOWR(ISST_IF_MAGIC, 1, struct isst_if_cpu_map *)
#define ISST_IF_IO_CMD _IOW(ISST_IF_MAGIC, 2, struct isst_if_io_regs *)
#define ISST_IF_MBOX_COMMAND _IOWR(ISST_IF_MAGIC, 3, struct isst_if_mbox_cmds *)
#endif