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-standa... Signed-off-by: Etienne Carriere etienne.carriere@linaro.org ---
drivers/firmware/scmi.c | 3 ++ drivers/reset/Kconfig | 8 ++++ drivers/reset/Makefile | 1 + drivers/reset/reset-scmi.c | 86 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 98 insertions(+) create mode 100644 drivers/reset/reset-scmi.c
diff --git a/drivers/firmware/scmi.c b/drivers/firmware/scmi.c index 9f06718df51..9be53a9cf11 100644 --- a/drivers/firmware/scmi.c +++ b/drivers/firmware/scmi.c @@ -402,6 +402,9 @@ static int scmi_bind(struct udevice *dev) case SCMI_PROTOCOL_ID_CLOCK: drv = DM_GET_DRIVER(scmi_clock); break; + case SCMI_PROTOCOL_ID_RESET_DOMAIN: + drv = DM_GET_DRIVER(scmi_reset_domain); + break; default: dev_info(dev, "Ignore unsupported SCMI protocol %u\n", protocol_id); diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 6d535612234..31bd4cd5b45 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -164,4 +164,12 @@ 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 8e0124b8dee..f3c0fbfd8f3 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -25,3 +25,4 @@ obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.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 00000000000..e664d91d865 --- /dev/null +++ b/drivers/reset/reset-scmi.c @@ -0,0 +1,86 @@ +// 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.h> +#include <asm/types.h> + +enum scmi_reset_domain_message_id { + SCMI_RESET_DOMAIN_RESET = 0x4, +}; + +#define SCMI_RD_RESET_FLAG_ASSERT BIT(1) +#define SCMI_RD_RESET_FLAG_DEASSERT 0 + +struct scmi_rd_reset_in { + u32 domain_id; + u32 flags; + u32 reset_state; +}; + +struct scmi_rd_reset_out { + s32 status; +}; + +static int scmi_reset_set_state(struct reset_ctl *rst, int assert_not_deassert) +{ + struct scmi_rd_reset_in in = { + .domain_id = rst->id, + .flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : + SCMI_RD_RESET_FLAG_DEASSERT, + .reset_state = 0, + }; + struct scmi_rd_reset_out out; + struct scmi_msg scmi_msg = { + .protocol_id = SCMI_PROTOCOL_ID_RESET_DOMAIN, + .message_id = SCMI_RESET_DOMAIN_RESET, + .in_msg = (u8 *)&in, + .in_msg_sz = sizeof(in), + .out_msg = (u8 *)&out, + .out_msg_sz = sizeof(out), + }; + int rc; + + rc = scmi_send_and_process_msg(rst->dev->parent, &scmi_msg); + if (rc) + return rc; + + return scmi_to_linux_errno(out.status); +} + +static int scmi_reset_assert(struct reset_ctl *rst) +{ + return scmi_reset_set_state(rst, SCMI_RD_RESET_FLAG_ASSERT); +} + +static int scmi_reset_deassert(struct reset_ctl *rst) +{ + return scmi_reset_set_state(rst, SCMI_RD_RESET_FLAG_DEASSERT); +} + +static int scmi_reset_request(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int scmi_reset_rfree(struct reset_ctl *reset_ctl) +{ + 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, +};