diff options
| -rw-r--r-- | drivers/firmware/scmi/scmi_agent-uclass.c | 4 | ||||
| -rw-r--r-- | drivers/reset/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-scmi.c | 81 | ||||
| -rw-r--r-- | include/scmi_protocols.h | 60 |
5 files changed, 154 insertions, 0 deletions
diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c index 1f36f23..77160b1 100644 --- a/drivers/firmware/scmi/scmi_agent-uclass.c +++ b/drivers/firmware/scmi/scmi_agent-uclass.c @@ -74,6 +74,10 @@ static int scmi_bind_protocols(struct udevice *dev) if (IS_ENABLED(CONFIG_CLK_SCMI)) drv = DM_GET_DRIVER(scmi_clock); break; + case SCMI_PROTOCOL_ID_RESET_DOMAIN: + if (IS_ENABLED(CONFIG_RESET_SCMI)) + drv = DM_GET_DRIVER(scmi_reset_domain); + break; default: break; } diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 3fdfe4a..b60e11f 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -181,4 +181,12 @@ config RESET_RASPBERRYPI relevant. This driver provides a reset controller capable of interfacing with RPi4's co-processor and model these firmware initialization routines as reset lines. + +config RESET_SCMI + bool "Enable SCMI reset domain driver" + select SCMI_FIRMWARE + help + Enable this option if you want to support reset controller + devices exposed by a SCMI agent based on SCMI reset domain + protocol communication with a SCMI server. endmenu diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 5176da5..10a7973 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -27,3 +27,4 @@ obj-$(CONFIG_RESET_IPQ419) += reset-ipq4019.o obj-$(CONFIG_RESET_SIFIVE) += reset-sifive.o obj-$(CONFIG_RESET_SYSCON) += reset-syscon.o obj-$(CONFIG_RESET_RASPBERRYPI) += reset-raspberrypi.o +obj-$(CONFIG_RESET_SCMI) += reset-scmi.o diff --git a/drivers/reset/reset-scmi.c b/drivers/reset/reset-scmi.c new file mode 100644 index 0000000..1bff807 --- /dev/null +++ b/drivers/reset/reset-scmi.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019-2020 Linaro Limited + */ +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <reset-uclass.h> +#include <scmi_agent.h> +#include <scmi_protocols.h> +#include <asm/types.h> + +static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert) +{ + struct scmi_rd_reset_in in = { + .domain_id = rst->id, + .flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0, + .reset_state = 0, + }; + struct scmi_rd_reset_out out; + struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN, + SCMI_RESET_DOMAIN_RESET, + in, out); + int ret; + + ret = devm_scmi_process_msg(rst->dev->parent, &msg); + if (ret) + return ret; + + return scmi_to_linux_errno(out.status); +} + +static int scmi_reset_assert(struct reset_ctl *rst) +{ + return scmi_reset_set_level(rst, true); +} + +static int scmi_reset_deassert(struct reset_ctl *rst) +{ + return scmi_reset_set_level(rst, false); +} + +static int scmi_reset_request(struct reset_ctl *rst) +{ + struct scmi_rd_attr_in in = { + .domain_id = rst->id, + }; + struct scmi_rd_attr_out out; + struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN, + SCMI_RESET_DOMAIN_ATTRIBUTES, + in, out); + int ret; + + /* + * We don't really care about the attribute, just check + * the reset domain exists. + */ + ret = devm_scmi_process_msg(rst->dev->parent, &msg); + if (ret) + return ret; + + return scmi_to_linux_errno(out.status); +} + +static int scmi_reset_rfree(struct reset_ctl *rst) +{ + return 0; +} + +static const struct reset_ops scmi_reset_domain_ops = { + .request = scmi_reset_request, + .rfree = scmi_reset_rfree, + .rst_assert = scmi_reset_assert, + .rst_deassert = scmi_reset_deassert, +}; + +U_BOOT_DRIVER(scmi_reset_domain) = { + .name = "scmi_reset_domain", + .id = UCLASS_RESET, + .ops = &scmi_reset_domain_ops, +}; diff --git a/include/scmi_protocols.h b/include/scmi_protocols.h index 4778bcf..ccab97c 100644 --- a/include/scmi_protocols.h +++ b/include/scmi_protocols.h @@ -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 */ |