lib: utils: Add MPXY RPMI mailbox driver for device power

Add MPXY RPMI mailbox driver for device power.

Signed-off-by: Joshua Yeong <joshua.yeong@starfivetech.com>
Reviewed-by: Rahul Pathak <rpathak@ventanamicro.com>
Link: https://lore.kernel.org/r/20251013153138.1574512-3-joshua.yeong@starfivetech.com
Signed-off-by: Anup Patel <anup@brainfault.org>

include/sbi_utils/mailbox/rpmi_msgprot.h

@@ -218,6 +218,7 @@ enum rpmi_servicegroup_id {
 	RPMI_SRVGRP_CPPC = 0x0006,
 	RPMI_SRVGRP_VOLTAGE = 0x00007,
 	RPMI_SRVGRP_CLOCK = 0x0008,
+	RPMI_SRVGRP_DEVICE_POWER = 0x0009,
 	RPMI_SRVGRP_ID_MAX_COUNT,
 
 	/* Reserved range for service groups */
@@ -784,4 +785,48 @@ struct rpmi_clock_get_rate_resp {
 	u32 clock_rate_high;
 };
 
+/** RPMI Device Power ServiceGroup Service IDs */
+enum rpmi_dpwr_service_id {
+	RPMI_DPWR_SRV_ENABLE_NOTIFICATION = 0x01,
+	RPMI_DPWR_SRV_GET_NUM_DOMAINS = 0x02,
+	RPMI_DPWR_SRV_GET_ATTRIBUTES = 0x03,
+	RPMI_DPWR_SRV_SET_STATE = 0x04,
+	RPMI_DPWR_SRV_GET_STATE = 0x05,
+	RPMI_DPWR_SRV_MAX_COUNT,
+};
+
+struct rpmi_dpwr_get_num_domain_resp {
+	s32 status;
+	u32 num_domain;
+};
+
+struct rpmi_dpwr_get_attrs_req {
+	u32 domain_id;
+};
+
+struct rpmi_dpwr_get_attrs_resp {
+	s32 status;
+	u32 flags;
+	u32 transition_latency;
+	u8 name[16];
+};
+
+struct rpmi_dpwr_set_state_req {
+	u32 domain_id;
+	u32 state;
+};
+
+struct rpmi_dpwr_set_state_resp {
+	s32 status;
+};
+
+struct rpmi_dpwr_get_state_req {
+	u32 domain_id;
+};
+
+struct rpmi_dpwr_get_state_resp {
+	s32 status;
+	u32 state;
+};
+
 #endif /* !__RPMI_MSGPROT_H__ */

lib/utils/mpxy/Kconfig

@@ -26,6 +26,10 @@ config FDT_MPXY_RPMI_VOLTAGE
 	bool "MPXY driver for RPMI voltage service group"
 	default n
 
+config FDT_MPXY_RPMI_DEVICE_POWER
+	bool "MPXY driver for RPMI device power service group"
+	default n
+
 endif
 
 endmenu

lib/utils/mpxy/fdt_mpxy_rpmi_device_power.c

@@ -0,0 +1,56 @@
+#include <sbi_utils/mpxy/fdt_mpxy_rpmi_mbox.h>
+
+static struct mpxy_rpmi_service_data dpwr_services[] = {
+{
+	.id = RPMI_DPWR_SRV_ENABLE_NOTIFICATION,
+	.min_tx_len = sizeof(struct rpmi_enable_notification_req),
+	.max_tx_len = sizeof(struct rpmi_enable_notification_req),
+	.min_rx_len = sizeof(struct rpmi_enable_notification_resp),
+	.max_rx_len = sizeof(struct rpmi_enable_notification_resp),
+},
+{
+	.id = RPMI_DPWR_SRV_GET_NUM_DOMAINS,
+	.min_tx_len = 0,
+	.max_tx_len = 0,
+	.min_rx_len = sizeof(struct rpmi_dpwr_get_num_domain_resp),
+	.max_rx_len = sizeof(struct rpmi_dpwr_get_num_domain_resp),
+},
+{
+	.id = RPMI_DPWR_SRV_GET_ATTRIBUTES,
+	.min_tx_len = sizeof(struct rpmi_dpwr_get_attrs_req),
+	.max_tx_len = sizeof(struct rpmi_dpwr_get_attrs_req),
+	.min_rx_len = sizeof(struct rpmi_dpwr_get_attrs_resp),
+	.max_rx_len = sizeof(struct rpmi_dpwr_get_attrs_resp),
+},
+{
+	.id = RPMI_DPWR_SRV_SET_STATE,
+	.min_tx_len = sizeof(struct rpmi_dpwr_set_state_req),
+	.max_tx_len = sizeof(struct rpmi_dpwr_set_state_req),
+	.min_rx_len = sizeof(struct rpmi_dpwr_set_state_resp),
+	.max_rx_len = sizeof(struct rpmi_dpwr_set_state_resp),
+},
+{
+	.id = RPMI_DPWR_SRV_GET_STATE,
+	.min_tx_len = sizeof(struct rpmi_dpwr_get_state_req),
+	.max_tx_len = sizeof(struct rpmi_dpwr_get_state_req),
+	.min_rx_len = sizeof(struct rpmi_dpwr_get_state_resp),
+	.max_rx_len = sizeof(struct rpmi_dpwr_get_state_resp),
+},
+};
+
+static const struct mpxy_rpmi_mbox_data dpwr_data = {
+	.servicegrp_id = RPMI_SRVGRP_DEVICE_POWER,
+	.num_services = RPMI_DPWR_SRV_MAX_COUNT,
+	.service_data = dpwr_services,
+};
+
+static const struct fdt_match dpwr_match[] = {
+	{ .compatible = "riscv,rpmi-mpxy-device-power", .data = &dpwr_data },
+	{ },
+};
+
+const struct fdt_driver fdt_mpxy_rpmi_device_power = {
+	.experimental = true,
+	.match_table = dpwr_match,
+	.init = mpxy_rpmi_mbox_init,
+};

lib/utils/mpxy/objects.mk

@@ -20,3 +20,6 @@ libsbiutils-objs-$(CONFIG_FDT_MPXY_RPMI_SYSMSI) += mpxy/fdt_mpxy_rpmi_sysmsi.o
 
 carray-fdt_mpxy_drivers-$(CONFIG_FDT_MPXY_RPMI_VOLTAGE) += fdt_mpxy_rpmi_voltage
 libsbiutils-objs-$(CONFIG_FDT_MPXY_RPMI_VOLTAGE) += mpxy/fdt_mpxy_rpmi_voltage.o
+
+carray-fdt_mpxy_drivers-$(CONFIG_FDT_MPXY_RPMI_DEVICE_POWER) += fdt_mpxy_rpmi_device_power
+libsbiutils-objs-$(CONFIG_FDT_MPXY_RPMI_DEVICE_POWER) += mpxy/fdt_mpxy_rpmi_device_power.o

platform/generic/configs/defconfig

@@ -65,4 +65,5 @@ CONFIG_FDT_MPXY=y
 CONFIG_FDT_MPXY_RPMI_MBOX=y
 CONFIG_FDT_MPXY_RPMI_CLOCK=y
 CONFIG_FDT_MPXY_RPMI_VOLTAGE=y
+CONFIG_FDT_MPXY_RPMI_DEVICE_POWER=y
 CONFIG_FDT_MPXY_RPMI_SYSMSI=y