lib: utils: Add MPXY RPMI mailbox driver for voltage

Add voltage service group for RPMI/MPXY support

Signed-off-by: Joshua Yeong <joshua.yeong@starfivetech.com>
Reviewed-by: Rahul Pathak <rpathak@ventanamicro.com>
Link: https://lore.kernel.org/r/20251013153138.1574512-2-joshua.yeong@starfivetech.com
Signed-off-by: Anup Patel <anup@brainfault.org>

include/sbi_utils/mailbox/rpmi_msgprot.h

@@ -216,6 +216,7 @@ enum rpmi_servicegroup_id {
 	RPMI_SRVGRP_SYSTEM_SUSPEND = 0x0004,
 	RPMI_SRVGRP_HSM = 0x0005,
 	RPMI_SRVGRP_CPPC = 0x0006,
+	RPMI_SRVGRP_VOLTAGE = 0x00007,
 	RPMI_SRVGRP_CLOCK = 0x0008,
 	RPMI_SRVGRP_ID_MAX_COUNT,
 
@@ -611,6 +612,86 @@ struct rpmi_cppc_hart_list_resp {
 	u32 hartid[(RPMI_MSG_DATA_SIZE(RPMI_SLOT_SIZE_MIN) - (sizeof(u32) * 3)) / sizeof(u32)];
 };
 
+/** RPMI Voltage ServiceGroup Service IDs */
+enum rpmi_voltage_service_id {
+	RPMI_VOLTAGE_SRV_ENABLE_NOTIFICATION = 0x01,
+	RPMI_VOLTAGE_SRV_GET_NUM_DOMAINS = 0x02,
+	RPMI_VOLTAGE_SRV_GET_ATTRIBUTES = 0x03,
+	RPMI_VOLTAGE_SRV_GET_SUPPORTED_LEVELS = 0x04,
+	RPMI_VOLTAGE_SRV_SET_CONFIG = 0x05,
+	RPMI_VOLTAGE_SRV_GET_CONFIG = 0x06,
+	RPMI_VOLTAGE_SRV_SET_LEVEL = 0x07,
+	RPMI_VOLTAGE_SRV_GET_LEVEL = 0x08,
+	RPMI_VOLTAGE_SRV_MAX_COUNT,
+};
+
+struct rpmi_voltage_get_num_domains_resp {
+       s32 status;
+       u32 num_domains;
+};
+
+struct rpmi_voltage_get_attributes_req {
+        u32 domain_id;
+};
+
+struct rpmi_voltage_get_attributes_resp {
+        s32 status;
+        u32 flags;
+        u32 num_levels;
+        u32 transition_latency;
+        u8 name[16];
+};
+
+struct rpmi_voltage_get_supported_rate_req {
+        u32 domain_id;
+        u32 index;
+};
+
+struct rpmi_voltage_get_supported_rate_resp {
+        s32 status;
+        u32 flags;
+        u32 remaining;
+        u32 returned;
+	u32 level[0];
+};
+
+struct rpmi_voltage_set_config_req {
+        u32 domain_id;
+#define RPMI_CLOCK_CONFIG_ENABLE                (1U << 0)
+        u32 config;
+};
+
+struct rpmi_voltage_set_config_resp {
+        s32 status;
+};
+
+struct rpmi_voltage_get_config_req {
+        u32 domain_id;
+};
+
+struct rpmi_voltage_get_config_resp {
+        s32 status;
+        u32 config;
+};
+
+struct rpmi_voltage_set_level_req {
+        u32 domain_id;
+        s32 level;
+};
+
+struct rpmi_voltage_set_level_resp {
+        s32 status;
+};
+
+struct rpmi_voltage_get_level_req {
+        u32 domain_id;
+};
+
+struct rpmi_voltage_get_level_resp {
+        s32 status;
+        s32 level;
+};
+
 /** RPMI Clock ServiceGroup Service IDs */
 enum rpmi_clock_service_id {
 	RPMI_CLOCK_SRV_ENABLE_NOTIFICATION = 0x01,

lib/utils/mpxy/Kconfig

@@ -22,6 +22,10 @@ config FDT_MPXY_RPMI_SYSMSI
 	bool "MPXY driver for RPMI system MSI service group"
 	default n
 
+config FDT_MPXY_RPMI_VOLTAGE
+	bool "MPXY driver for RPMI voltage service group"
+	default n
+
 endif
 
 endmenu

lib/utils/mpxy/fdt_mpxy_rpmi_voltage.c

@@ -0,0 +1,77 @@
+#include <sbi_utils/mpxy/fdt_mpxy_rpmi_mbox.h>
+
+static struct mpxy_rpmi_service_data voltage_services[] = {
+{
+	.id = RPMI_VOLTAGE_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_VOLTAGE_SRV_GET_NUM_DOMAINS,
+	.min_tx_len = 0,
+	.max_tx_len = 0,
+	.min_rx_len = sizeof(struct rpmi_voltage_get_num_domains_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_get_num_domains_resp),
+},
+{
+	.id = RPMI_VOLTAGE_SRV_GET_ATTRIBUTES,
+	.min_tx_len = sizeof(struct rpmi_voltage_get_attributes_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_get_attributes_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_get_attributes_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_get_attributes_resp),
+},
+{
+	.id = RPMI_VOLTAGE_SRV_GET_SUPPORTED_LEVELS,
+	.min_tx_len = sizeof(struct rpmi_voltage_get_supported_rate_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_get_supported_rate_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_get_supported_rate_resp),
+	.max_rx_len = -1U,
+},
+{
+	.id = RPMI_VOLTAGE_SRV_SET_CONFIG,
+	.min_tx_len = sizeof(struct rpmi_voltage_set_config_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_set_config_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_set_config_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_set_config_resp),
+},
+{
+	.id = RPMI_VOLTAGE_SRV_GET_CONFIG,
+	.min_tx_len = sizeof(struct rpmi_voltage_get_config_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_get_config_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_get_config_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_get_config_resp),
+},
+{
+	.id = RPMI_VOLTAGE_SRV_SET_LEVEL,
+	.min_tx_len = sizeof(struct rpmi_voltage_set_level_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_set_level_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_set_level_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_set_level_resp),
+},
+{
+	.id = RPMI_VOLTAGE_SRV_GET_LEVEL,
+	.min_tx_len = sizeof(struct rpmi_voltage_get_level_req),
+	.max_tx_len = sizeof(struct rpmi_voltage_get_level_req),
+	.min_rx_len = sizeof(struct rpmi_voltage_get_level_resp),
+	.max_rx_len = sizeof(struct rpmi_voltage_get_level_resp),
+},
+};
+
+static const struct mpxy_rpmi_mbox_data voltage_data = {
+	.servicegrp_id = RPMI_SRVGRP_VOLTAGE,
+	.num_services = RPMI_VOLTAGE_SRV_MAX_COUNT,
+	.service_data = voltage_services,
+};
+
+static const struct fdt_match voltage_match[] = {
+	{ .compatible = "riscv,rpmi-mpxy-voltage", .data = &voltage_data },
+	{ },
+};
+
+const struct fdt_driver fdt_mpxy_rpmi_voltage = {
+	.experimental = true,
+	.match_table = voltage_match,
+	.init = mpxy_rpmi_mbox_init,
+};

lib/utils/mpxy/objects.mk

@@ -17,3 +17,6 @@ libsbiutils-objs-$(CONFIG_FDT_MPXY_RPMI_CLOCK) += mpxy/fdt_mpxy_rpmi_clock.o
 
 carray-fdt_mpxy_drivers-$(CONFIG_FDT_MPXY_RPMI_SYSMSI) += fdt_mpxy_rpmi_sysmsi
 libsbiutils-objs-$(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

platform/generic/configs/defconfig

@@ -64,4 +64,5 @@ CONFIG_FDT_TIMER_PLMT=y
 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_SYSMSI=y