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reset: add reset controller driver for SCMI agents

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This change introduces a reset controller driver for SCMI agent devices.
When SCMI agent and SCMI reset domain drivers are enabled, SCMI agent
binds a reset controller device for each SCMI reset domain protocol
devices enabled in the FDT.

SCMI reset driver is embedded upon CONFIG_RESET_SCMI=y. If enabled,
CONFIG_SCMI_AGENT is also enabled.

SCMI Reset Domain protocol is defined in the SCMI specification [1].

Links: [1] https://developer.arm.com/architectures/system-architectures/software-standards/scmi
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Etienne Carriere 2020-09-09 18:44:06 +02:00 • committed by Tom Rini
parent 87d4f277d4
commit 34d76fefb2
5 changed files with 154 additions and 0 deletions
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60
include/scmi_protocols.h
View file

@ -116,4 +116,64 @@ struct scmi_clk_rate_set_out {
s32 status;
};
/*
* SCMI Reset Domain Protocol
*/
enum scmi_reset_domain_message_id {
SCMI_RESET_DOMAIN_ATTRIBUTES = 0x3,
SCMI_RESET_DOMAIN_RESET = 0x4,
};
#define SCMI_RD_NAME_LEN 16
#define SCMI_RD_ATTRIBUTES_FLAG_ASYNC BIT(31)
#define SCMI_RD_ATTRIBUTES_FLAG_NOTIF BIT(30)
#define SCMI_RD_RESET_FLAG_ASYNC BIT(2)
#define SCMI_RD_RESET_FLAG_ASSERT BIT(1)
#define SCMI_RD_RESET_FLAG_CYCLE BIT(0)
/**
* struct scmi_rd_attr_in - Payload for RESET_DOMAIN_ATTRIBUTES message
* @domain_id: SCMI reset domain ID
*/
struct scmi_rd_attr_in {
u32 domain_id;
};
/**
* struct scmi_rd_attr_out - Payload for RESET_DOMAIN_ATTRIBUTES response
* @status: SCMI command status
* @attributes: Retrieved attributes of the reset domain
* @latency: Reset cycle max lantency
* @name: Reset domain name
*/
struct scmi_rd_attr_out {
s32 status;
u32 attributes;
u32 latency;
char name[SCMI_RD_NAME_LEN];
};
/**
* struct scmi_rd_reset_in - Message payload for RESET command
* @domain_id: SCMI reset domain ID
* @flags: Flags for the reset request
* @reset_state: Reset target state
*/
struct scmi_rd_reset_in {
u32 domain_id;
u32 flags;
u32 reset_state;
};
/**
* struct scmi_rd_reset_out - Response payload for RESET command
* @status: SCMI command status
*/
struct scmi_rd_reset_out {
s32 status;
};
#endif /* _SCMI_PROTOCOLS_H */