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firmware: arm_scmi: Add voltage domain management protocol support
SCMI v3.0 introduces voltage domain protocol which provides commands to: - Discover the voltage levels supported by a domain - Get the configuration and voltage level of a domain - Set the configuration and voltage level of a domain Let us add support for the same. Link: https://lore.kernel.org/r/20201119191051.46363-2-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi
Sudeep Holla
parent
0f80fcec08
commit
2add5cacff
5 changed files with 448 additions and 1 deletions
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@ -4,7 +4,7 @@ scmi-driver-y = driver.o notify.o
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scmi-transport-y = shmem.o
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scmi-transport-$(CONFIG_MAILBOX) += mailbox.o
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scmi-transport-$(CONFIG_HAVE_ARM_SMCCC_DISCOVERY) += smc.o
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scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o
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scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o voltage.o
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scmi-module-objs := $(scmi-bus-y) $(scmi-driver-y) $(scmi-protocols-y) \
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$(scmi-transport-y)
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obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-module.o
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@ -169,6 +169,7 @@ DECLARE_SCMI_REGISTER_UNREGISTER(perf);
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DECLARE_SCMI_REGISTER_UNREGISTER(power);
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DECLARE_SCMI_REGISTER_UNREGISTER(reset);
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DECLARE_SCMI_REGISTER_UNREGISTER(sensors);
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DECLARE_SCMI_REGISTER_UNREGISTER(voltage);
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DECLARE_SCMI_REGISTER_UNREGISTER(system);
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#define DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(id, name) \
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@ -946,6 +946,7 @@ static int __init scmi_driver_init(void)
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scmi_power_register();
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scmi_reset_register();
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scmi_sensors_register();
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scmi_voltage_register();
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scmi_system_register();
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return platform_driver_register(&scmi_driver);
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@ -961,6 +962,7 @@ static void __exit scmi_driver_exit(void)
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scmi_power_unregister();
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scmi_reset_unregister();
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scmi_sensors_unregister();
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scmi_voltage_unregister();
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scmi_system_unregister();
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platform_driver_unregister(&scmi_driver);
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380
drivers/firmware/arm_scmi/voltage.c
Normal file
380
drivers/firmware/arm_scmi/voltage.c
Normal file
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@ -0,0 +1,380 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) Voltage Protocol
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*
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* Copyright (C) 2020 ARM Ltd.
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*/
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#include <linux/scmi_protocol.h>
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#include "common.h"
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#define VOLTAGE_DOMS_NUM_MASK GENMASK(15, 0)
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#define REMAINING_LEVELS_MASK GENMASK(31, 16)
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#define RETURNED_LEVELS_MASK GENMASK(11, 0)
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enum scmi_voltage_protocol_cmd {
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VOLTAGE_DOMAIN_ATTRIBUTES = 0x3,
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VOLTAGE_DESCRIBE_LEVELS = 0x4,
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VOLTAGE_CONFIG_SET = 0x5,
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VOLTAGE_CONFIG_GET = 0x6,
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VOLTAGE_LEVEL_SET = 0x7,
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VOLTAGE_LEVEL_GET = 0x8,
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};
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#define NUM_VOLTAGE_DOMAINS(x) ((u16)(FIELD_GET(VOLTAGE_DOMS_NUM_MASK, (x))))
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struct scmi_msg_resp_domain_attributes {
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__le32 attr;
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u8 name[SCMI_MAX_STR_SIZE];
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};
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struct scmi_msg_cmd_describe_levels {
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__le32 domain_id;
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__le32 level_index;
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};
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struct scmi_msg_resp_describe_levels {
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__le32 flags;
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#define NUM_REMAINING_LEVELS(f) ((u16)(FIELD_GET(REMAINING_LEVELS_MASK, (f))))
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#define NUM_RETURNED_LEVELS(f) ((u16)(FIELD_GET(RETURNED_LEVELS_MASK, (f))))
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#define SUPPORTS_SEGMENTED_LEVELS(f) ((f) & BIT(12))
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__le32 voltage[];
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};
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struct scmi_msg_cmd_config_set {
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__le32 domain_id;
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__le32 config;
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};
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struct scmi_msg_cmd_level_set {
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__le32 domain_id;
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__le32 flags;
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__le32 voltage_level;
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};
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struct voltage_info {
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unsigned int version;
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unsigned int num_domains;
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struct scmi_voltage_info *domains;
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};
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static int scmi_protocol_attributes_get(const struct scmi_handle *handle,
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struct voltage_info *vinfo)
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{
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int ret;
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struct scmi_xfer *t;
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ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
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SCMI_PROTOCOL_VOLTAGE, 0, sizeof(__le32), &t);
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if (ret)
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return ret;
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ret = scmi_do_xfer(handle, t);
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if (!ret)
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vinfo->num_domains =
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NUM_VOLTAGE_DOMAINS(get_unaligned_le32(t->rx.buf));
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scmi_xfer_put(handle, t);
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return ret;
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}
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static int scmi_init_voltage_levels(struct device *dev,
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struct scmi_voltage_info *v,
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u32 num_returned, u32 num_remaining,
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bool segmented)
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{
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u32 num_levels;
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num_levels = num_returned + num_remaining;
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/*
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* segmented levels entries are represented by a single triplet
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* returned all in one go.
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*/
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if (!num_levels ||
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(segmented && (num_remaining || num_returned != 3))) {
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dev_err(dev,
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"Invalid level descriptor(%d/%d/%d) for voltage dom %d\n",
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num_levels, num_returned, num_remaining, v->id);
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return -EINVAL;
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}
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v->levels_uv = devm_kcalloc(dev, num_levels, sizeof(u32), GFP_KERNEL);
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if (!v->levels_uv)
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return -ENOMEM;
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v->num_levels = num_levels;
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v->segmented = segmented;
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return 0;
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}
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static int scmi_voltage_descriptors_get(const struct scmi_handle *handle,
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struct voltage_info *vinfo)
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{
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int ret, dom;
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struct scmi_xfer *td, *tl;
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struct device *dev = handle->dev;
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struct scmi_msg_resp_domain_attributes *resp_dom;
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struct scmi_msg_resp_describe_levels *resp_levels;
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ret = scmi_xfer_get_init(handle, VOLTAGE_DOMAIN_ATTRIBUTES,
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SCMI_PROTOCOL_VOLTAGE, sizeof(__le32),
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sizeof(*resp_dom), &td);
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if (ret)
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return ret;
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resp_dom = td->rx.buf;
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ret = scmi_xfer_get_init(handle, VOLTAGE_DESCRIBE_LEVELS,
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SCMI_PROTOCOL_VOLTAGE, sizeof(__le64), 0, &tl);
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if (ret)
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goto outd;
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resp_levels = tl->rx.buf;
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for (dom = 0; dom < vinfo->num_domains; dom++) {
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u32 desc_index = 0;
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u16 num_returned = 0, num_remaining = 0;
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struct scmi_msg_cmd_describe_levels *cmd;
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struct scmi_voltage_info *v;
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/* Retrieve domain attributes at first ... */
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put_unaligned_le32(dom, td->tx.buf);
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ret = scmi_do_xfer(handle, td);
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/* Skip domain on comms error */
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if (ret)
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continue;
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v = vinfo->domains + dom;
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v->id = dom;
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v->attributes = le32_to_cpu(resp_dom->attr);
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strlcpy(v->name, resp_dom->name, SCMI_MAX_STR_SIZE);
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cmd = tl->tx.buf;
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/* ...then retrieve domain levels descriptions */
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do {
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u32 flags;
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int cnt;
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cmd->domain_id = cpu_to_le32(v->id);
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cmd->level_index = desc_index;
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ret = scmi_do_xfer(handle, tl);
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if (ret)
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break;
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flags = le32_to_cpu(resp_levels->flags);
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num_returned = NUM_RETURNED_LEVELS(flags);
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num_remaining = NUM_REMAINING_LEVELS(flags);
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/* Allocate space for num_levels if not already done */
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if (!v->num_levels) {
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ret = scmi_init_voltage_levels(dev, v,
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num_returned,
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num_remaining,
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SUPPORTS_SEGMENTED_LEVELS(flags));
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if (ret)
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break;
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}
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if (desc_index + num_returned > v->num_levels) {
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dev_err(handle->dev,
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"No. of voltage levels can't exceed %d\n",
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v->num_levels);
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ret = -EINVAL;
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break;
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}
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for (cnt = 0; cnt < num_returned; cnt++) {
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s32 val;
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val =
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(s32)le32_to_cpu(resp_levels->voltage[cnt]);
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v->levels_uv[desc_index + cnt] = val;
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if (val < 0)
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v->negative_volts_allowed = true;
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}
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desc_index += num_returned;
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scmi_reset_rx_to_maxsz(handle, tl);
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/* check both to avoid infinite loop due to buggy fw */
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} while (num_returned && num_remaining);
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if (ret) {
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v->num_levels = 0;
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devm_kfree(dev, v->levels_uv);
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}
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scmi_reset_rx_to_maxsz(handle, td);
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}
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scmi_xfer_put(handle, tl);
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outd:
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scmi_xfer_put(handle, td);
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return ret;
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}
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static int __scmi_voltage_get_u32(const struct scmi_handle *handle,
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u8 cmd_id, u32 domain_id, u32 *value)
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{
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int ret;
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struct scmi_xfer *t;
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struct voltage_info *vinfo = handle->voltage_priv;
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if (domain_id >= vinfo->num_domains)
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return -EINVAL;
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ret = scmi_xfer_get_init(handle, cmd_id,
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SCMI_PROTOCOL_VOLTAGE,
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sizeof(__le32), 0, &t);
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if (ret)
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return ret;
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put_unaligned_le32(domain_id, t->tx.buf);
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ret = scmi_do_xfer(handle, t);
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if (!ret)
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*value = get_unaligned_le32(t->rx.buf);
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scmi_xfer_put(handle, t);
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return ret;
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}
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static int scmi_voltage_config_set(const struct scmi_handle *handle,
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u32 domain_id, u32 config)
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{
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int ret;
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struct scmi_xfer *t;
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struct voltage_info *vinfo = handle->voltage_priv;
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struct scmi_msg_cmd_config_set *cmd;
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if (domain_id >= vinfo->num_domains)
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return -EINVAL;
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ret = scmi_xfer_get_init(handle, VOLTAGE_CONFIG_SET,
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SCMI_PROTOCOL_VOLTAGE,
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sizeof(*cmd), 0, &t);
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if (ret)
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return ret;
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cmd = t->tx.buf;
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cmd->domain_id = cpu_to_le32(domain_id);
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cmd->config = cpu_to_le32(config & GENMASK(3, 0));
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ret = scmi_do_xfer(handle, t);
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scmi_xfer_put(handle, t);
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return ret;
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}
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static int scmi_voltage_config_get(const struct scmi_handle *handle,
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u32 domain_id, u32 *config)
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{
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return __scmi_voltage_get_u32(handle, VOLTAGE_CONFIG_GET,
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domain_id, config);
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}
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static int scmi_voltage_level_set(const struct scmi_handle *handle,
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u32 domain_id, u32 flags, s32 volt_uV)
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{
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int ret;
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struct scmi_xfer *t;
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struct voltage_info *vinfo = handle->voltage_priv;
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struct scmi_msg_cmd_level_set *cmd;
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if (domain_id >= vinfo->num_domains)
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return -EINVAL;
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ret = scmi_xfer_get_init(handle, VOLTAGE_LEVEL_SET,
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SCMI_PROTOCOL_VOLTAGE,
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sizeof(*cmd), 0, &t);
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if (ret)
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return ret;
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cmd = t->tx.buf;
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cmd->domain_id = cpu_to_le32(domain_id);
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cmd->flags = cpu_to_le32(flags);
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cmd->voltage_level = cpu_to_le32(volt_uV);
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ret = scmi_do_xfer(handle, t);
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scmi_xfer_put(handle, t);
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return ret;
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}
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static int scmi_voltage_level_get(const struct scmi_handle *handle,
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u32 domain_id, s32 *volt_uV)
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{
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return __scmi_voltage_get_u32(handle, VOLTAGE_LEVEL_GET,
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domain_id, (u32 *)volt_uV);
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}
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static const struct scmi_voltage_info * __must_check
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scmi_voltage_info_get(const struct scmi_handle *handle, u32 domain_id)
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{
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struct voltage_info *vinfo = handle->voltage_priv;
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if (domain_id >= vinfo->num_domains ||
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!vinfo->domains[domain_id].num_levels)
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return NULL;
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return vinfo->domains + domain_id;
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}
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static int scmi_voltage_domains_num_get(const struct scmi_handle *handle)
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{
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struct voltage_info *vinfo = handle->voltage_priv;
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return vinfo->num_domains;
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}
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static struct scmi_voltage_ops voltage_ops = {
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.num_domains_get = scmi_voltage_domains_num_get,
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.info_get = scmi_voltage_info_get,
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.config_set = scmi_voltage_config_set,
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.config_get = scmi_voltage_config_get,
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.level_set = scmi_voltage_level_set,
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.level_get = scmi_voltage_level_get,
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};
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static int scmi_voltage_protocol_init(struct scmi_handle *handle)
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{
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int ret;
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u32 version;
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struct voltage_info *vinfo;
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ret = scmi_version_get(handle, SCMI_PROTOCOL_VOLTAGE, &version);
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if (ret)
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return ret;
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dev_dbg(handle->dev, "Voltage Version %d.%d\n",
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PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
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vinfo = devm_kzalloc(handle->dev, sizeof(*vinfo), GFP_KERNEL);
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if (!vinfo)
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return -ENOMEM;
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vinfo->version = version;
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ret = scmi_protocol_attributes_get(handle, vinfo);
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if (ret)
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return ret;
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if (vinfo->num_domains) {
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vinfo->domains = devm_kcalloc(handle->dev, vinfo->num_domains,
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sizeof(*vinfo->domains),
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GFP_KERNEL);
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if (!vinfo->domains)
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return -ENOMEM;
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ret = scmi_voltage_descriptors_get(handle, vinfo);
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if (ret)
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return ret;
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} else {
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dev_warn(handle->dev, "No Voltage domains found.\n");
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}
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handle->voltage_ops = &voltage_ops;
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handle->voltage_priv = vinfo;
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return 0;
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}
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DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(SCMI_PROTOCOL_VOLTAGE, voltage)
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@ -209,6 +209,64 @@ struct scmi_reset_ops {
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int (*deassert)(const struct scmi_handle *handle, u32 domain);
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};
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/**
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* struct scmi_voltage_info - describe one available SCMI Voltage Domain
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*
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* @id: the domain ID as advertised by the platform
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* @segmented: defines the layout of the entries of array @levels_uv.
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* - when True the entries are to be interpreted as triplets,
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* each defining a segment representing a range of equally
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* space voltages: <lowest_volts>, <highest_volt>, <step_uV>
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* - when False the entries simply represent a single discrete
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* supported voltage level
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* @negative_volts_allowed: True if any of the entries of @levels_uv represent
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* a negative voltage.
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* @attributes: represents Voltage Domain advertised attributes
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* @name: name assigned to the Voltage Domain by platform
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* @num_levels: number of total entries in @levels_uv.
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* @levels_uv: array of entries describing the available voltage levels for
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* this domain.
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*/
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struct scmi_voltage_info {
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unsigned int id;
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bool segmented;
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bool negative_volts_allowed;
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unsigned int attributes;
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char name[SCMI_MAX_STR_SIZE];
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unsigned int num_levels;
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#define SCMI_VOLTAGE_SEGMENT_LOW 0
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#define SCMI_VOLTAGE_SEGMENT_HIGH 1
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#define SCMI_VOLTAGE_SEGMENT_STEP 2
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int *levels_uv;
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};
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/**
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* struct scmi_voltage_ops - represents the various operations provided
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* by SCMI Voltage Protocol
|
||||
*
|
||||
* @num_domains_get: get the count of voltage domains provided by SCMI
|
||||
* @info_get: get the information of the specified domain
|
||||
* @config_set: set the config for the specified domain
|
||||
* @config_get: get the config of the specified domain
|
||||
* @level_set: set the voltage level for the specified domain
|
||||
* @level_get: get the voltage level of the specified domain
|
||||
*/
|
||||
struct scmi_voltage_ops {
|
||||
int (*num_domains_get)(const struct scmi_handle *handle);
|
||||
const struct scmi_voltage_info __must_check *(*info_get)
|
||||
(const struct scmi_handle *handle, u32 domain_id);
|
||||
int (*config_set)(const struct scmi_handle *handle, u32 domain_id,
|
||||
u32 config);
|
||||
#define SCMI_VOLTAGE_ARCH_STATE_OFF 0x0
|
||||
#define SCMI_VOLTAGE_ARCH_STATE_ON 0x7
|
||||
int (*config_get)(const struct scmi_handle *handle, u32 domain_id,
|
||||
u32 *config);
|
||||
int (*level_set)(const struct scmi_handle *handle, u32 domain_id,
|
||||
u32 flags, s32 volt_uV);
|
||||
int (*level_get)(const struct scmi_handle *handle, u32 domain_id,
|
||||
s32 *volt_uV);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct scmi_notify_ops - represents notifications' operations provided by
|
||||
* SCMI core
|
||||
|
|
@ -262,6 +320,7 @@ struct scmi_notify_ops {
|
|||
* @clk_ops: pointer to set of clock protocol operations
|
||||
* @sensor_ops: pointer to set of sensor protocol operations
|
||||
* @reset_ops: pointer to set of reset protocol operations
|
||||
* @voltage_ops: pointer to set of voltage protocol operations
|
||||
* @notify_ops: pointer to set of notifications related operations
|
||||
* @perf_priv: pointer to private data structure specific to performance
|
||||
* protocol(for internal use only)
|
||||
|
|
@ -273,6 +332,8 @@ struct scmi_notify_ops {
|
|||
* protocol(for internal use only)
|
||||
* @reset_priv: pointer to private data structure specific to reset
|
||||
* protocol(for internal use only)
|
||||
* @voltage_priv: pointer to private data structure specific to voltage
|
||||
* protocol(for internal use only)
|
||||
* @notify_priv: pointer to private data structure specific to notifications
|
||||
* (for internal use only)
|
||||
*/
|
||||
|
|
@ -284,6 +345,7 @@ struct scmi_handle {
|
|||
const struct scmi_power_ops *power_ops;
|
||||
const struct scmi_sensor_ops *sensor_ops;
|
||||
const struct scmi_reset_ops *reset_ops;
|
||||
const struct scmi_voltage_ops *voltage_ops;
|
||||
const struct scmi_notify_ops *notify_ops;
|
||||
/* for protocol internal use */
|
||||
void *perf_priv;
|
||||
|
|
@ -291,6 +353,7 @@ struct scmi_handle {
|
|||
void *power_priv;
|
||||
void *sensor_priv;
|
||||
void *reset_priv;
|
||||
void *voltage_priv;
|
||||
void *notify_priv;
|
||||
void *system_priv;
|
||||
};
|
||||
|
|
@ -303,6 +366,7 @@ enum scmi_std_protocol {
|
|||
SCMI_PROTOCOL_CLOCK = 0x14,
|
||||
SCMI_PROTOCOL_SENSOR = 0x15,
|
||||
SCMI_PROTOCOL_RESET = 0x16,
|
||||
SCMI_PROTOCOL_VOLTAGE = 0x17,
|
||||
};
|
||||
|
||||
enum scmi_system_events {
|
||||
|
|
|
|||
Loading…
Reference in a new issue