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path: root/drivers/scmi-msg/clock.c
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Diffstat (limited to 'drivers/scmi-msg/clock.c')
-rw-r--r--drivers/scmi-msg/clock.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/scmi-msg/clock.c b/drivers/scmi-msg/clock.c
new file mode 100644
index 0000000000..e96cede6ed
--- /dev/null
+++ b/drivers/scmi-msg/clock.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2015-2020, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2020, Linaro Limited
+ */
+#include <cdefs.h>
+#include <string.h>
+
+#include <drivers/scmi-msg.h>
+#include <drivers/scmi.h>
+#include <lib/utils_def.h>
+
+#include "common.h"
+
+#pragma weak plat_scmi_clock_count
+#pragma weak plat_scmi_clock_get_name
+#pragma weak plat_scmi_clock_rates_array
+#pragma weak plat_scmi_clock_rates_by_step
+#pragma weak plat_scmi_clock_get_rate
+#pragma weak plat_scmi_clock_set_rate
+#pragma weak plat_scmi_clock_get_state
+#pragma weak plat_scmi_clock_set_state
+
+static bool message_id_is_supported(unsigned int message_id);
+
+size_t plat_scmi_clock_count(unsigned int agent_id __unused)
+{
+ return 0U;
+}
+
+const char *plat_scmi_clock_get_name(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused)
+{
+ return NULL;
+}
+
+int32_t plat_scmi_clock_rates_array(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused,
+ unsigned long *rates __unused,
+ size_t *nb_elts __unused)
+{
+ return SCMI_NOT_SUPPORTED;
+}
+
+int32_t plat_scmi_clock_rates_by_step(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused,
+ unsigned long *steps __unused)
+{
+ return SCMI_NOT_SUPPORTED;
+}
+
+unsigned long plat_scmi_clock_get_rate(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused)
+{
+ return 0U;
+}
+
+int32_t plat_scmi_clock_set_rate(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused,
+ unsigned long rate __unused)
+{
+ return SCMI_NOT_SUPPORTED;
+}
+
+int32_t plat_scmi_clock_get_state(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused)
+{
+ return SCMI_NOT_SUPPORTED;
+}
+
+int32_t plat_scmi_clock_set_state(unsigned int agent_id __unused,
+ unsigned int scmi_id __unused,
+ bool enable_not_disable __unused)
+{
+ return SCMI_NOT_SUPPORTED;
+}
+
+static void report_version(struct scmi_msg *msg)
+{
+ struct scmi_protocol_version_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ .version = SCMI_PROTOCOL_VERSION_CLOCK,
+ };
+
+ if (msg->in_size != 0) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void report_attributes(struct scmi_msg *msg)
+{
+ size_t agent_count = plat_scmi_clock_count(msg->agent_id);
+ struct scmi_protocol_attributes_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ .attributes = SCMI_CLOCK_PROTOCOL_ATTRIBUTES(1U, agent_count),
+ };
+
+ if (msg->in_size != 0) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void report_message_attributes(struct scmi_msg *msg)
+{
+ struct scmi_protocol_message_attributes_a2p *in_args = (void *)msg->in;
+ struct scmi_protocol_message_attributes_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ /* For this protocol, attributes shall be zero */
+ .attributes = 0U,
+ };
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ if (!message_id_is_supported(in_args->message_id)) {
+ scmi_status_response(msg, SCMI_NOT_FOUND);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void scmi_clock_attributes(struct scmi_msg *msg)
+{
+ const struct scmi_clock_attributes_a2p *in_args = (void *)msg->in;
+ struct scmi_clock_attributes_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ };
+ const char *name = NULL;
+ unsigned int clock_id = 0U;
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ clock_id = SPECULATION_SAFE_VALUE(in_args->clock_id);
+
+ if (clock_id >= plat_scmi_clock_count(msg->agent_id)) {
+ scmi_status_response(msg, SCMI_INVALID_PARAMETERS);
+ return;
+ }
+
+
+ name = plat_scmi_clock_get_name(msg->agent_id, clock_id);
+ if (name == NULL) {
+ scmi_status_response(msg, SCMI_NOT_FOUND);
+ return;
+ }
+
+ COPY_NAME_IDENTIFIER(return_values.clock_name, name);
+
+ return_values.attributes = plat_scmi_clock_get_state(msg->agent_id,
+ clock_id);
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void scmi_clock_rate_get(struct scmi_msg *msg)
+{
+ const struct scmi_clock_rate_get_a2p *in_args = (void *)msg->in;
+ unsigned long rate = 0U;
+ struct scmi_clock_rate_get_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ };
+ unsigned int clock_id = 0U;
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ clock_id = SPECULATION_SAFE_VALUE(in_args->clock_id);
+
+ if (clock_id >= plat_scmi_clock_count(msg->agent_id)) {
+ scmi_status_response(msg, SCMI_INVALID_PARAMETERS);
+ return;
+ }
+
+ rate = plat_scmi_clock_get_rate(msg->agent_id, clock_id);
+
+ return_values.rate[0] = (uint32_t)rate;
+ return_values.rate[1] = (uint32_t)((uint64_t)rate >> 32);
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void scmi_clock_rate_set(struct scmi_msg *msg)
+{
+ const struct scmi_clock_rate_set_a2p *in_args = (void *)msg->in;
+ unsigned long rate = 0U;
+ int32_t status = 0;
+ unsigned int clock_id = 0U;
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ clock_id = SPECULATION_SAFE_VALUE(in_args->clock_id);
+
+ if (clock_id >= plat_scmi_clock_count(msg->agent_id)) {
+ scmi_status_response(msg, SCMI_INVALID_PARAMETERS);
+ return;
+ }
+
+ rate = (unsigned long)(((uint64_t)in_args->rate[1] << 32) |
+ in_args->rate[0]);
+
+ status = plat_scmi_clock_set_rate(msg->agent_id, clock_id, rate);
+
+ scmi_status_response(msg, status);
+}
+
+static void scmi_clock_config_set(struct scmi_msg *msg)
+{
+ const struct scmi_clock_config_set_a2p *in_args = (void *)msg->in;
+ int32_t status = SCMI_GENERIC_ERROR;
+ bool enable = false;
+ unsigned int clock_id = 0U;
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ clock_id = SPECULATION_SAFE_VALUE(in_args->clock_id);
+
+ if (clock_id >= plat_scmi_clock_count(msg->agent_id)) {
+ scmi_status_response(msg, SCMI_INVALID_PARAMETERS);
+ return;
+ }
+
+ enable = in_args->attributes & SCMI_CLOCK_CONFIG_SET_ENABLE_MASK;
+
+ status = plat_scmi_clock_set_state(msg->agent_id, clock_id, enable);
+
+ scmi_status_response(msg, status);
+}
+
+#define RATES_ARRAY_SIZE_MAX (SCMI_PLAYLOAD_MAX - \
+ sizeof(struct scmi_clock_describe_rates_p2a))
+
+#define SCMI_RATES_BY_ARRAY(_nb_rates, _rem_rates) \
+ SCMI_CLOCK_DESCRIBE_RATES_NUM_RATES_FLAGS((_nb_rates), \
+ SCMI_CLOCK_RATE_FORMAT_LIST, \
+ (_rem_rates))
+#define SCMI_RATES_BY_STEP \
+ SCMI_CLOCK_DESCRIBE_RATES_NUM_RATES_FLAGS(3U, \
+ SCMI_CLOCK_RATE_FORMAT_RANGE, \
+ 0U)
+
+#define RATE_DESC_SIZE sizeof(struct scmi_clock_rate)
+
+static void write_rate_desc_array_in_buffer(char *dest, unsigned long *rates,
+ size_t nb_elt)
+{
+ uint32_t *out = (uint32_t *)(uintptr_t)dest;
+ size_t n;
+
+ ASSERT_SYM_PTR_ALIGN(out);
+
+ for (n = 0U; n < nb_elt; n++) {
+ out[2 * n] = (uint32_t)rates[n];
+ out[2 * n + 1] = (uint32_t)((uint64_t)rates[n] >> 32);
+ }
+}
+
+static void scmi_clock_describe_rates(struct scmi_msg *msg)
+{
+ const struct scmi_clock_describe_rates_a2p *in_args = (void *)msg->in;
+ struct scmi_clock_describe_rates_p2a p2a = {
+ .status = SCMI_SUCCESS,
+ };
+ size_t nb_rates;
+ int32_t status;
+ unsigned int clock_id;
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ clock_id = SPECULATION_SAFE_VALUE(in_args->clock_id);
+
+ if (clock_id >= plat_scmi_clock_count(msg->agent_id)) {
+ scmi_status_response(msg, SCMI_INVALID_PARAMETERS);
+ return;
+ }
+
+ /* Platform may support array rate description */
+ status = plat_scmi_clock_rates_array(msg->agent_id, clock_id, NULL,
+ &nb_rates);
+ if (status == SCMI_SUCCESS) {
+ /* Currently 12 cells mex, so it's affordable for the stack */
+ unsigned long plat_rates[RATES_ARRAY_SIZE_MAX / RATE_DESC_SIZE];
+ size_t max_nb = RATES_ARRAY_SIZE_MAX / RATE_DESC_SIZE;
+ size_t ret_nb = MIN(nb_rates - in_args->rate_index, max_nb);
+ size_t rem_nb = nb_rates - in_args->rate_index - ret_nb;
+
+ status = plat_scmi_clock_rates_array(msg->agent_id, clock_id,
+ plat_rates, &ret_nb);
+ if (status == SCMI_SUCCESS) {
+ write_rate_desc_array_in_buffer(msg->out + sizeof(p2a),
+ plat_rates, ret_nb);
+
+ p2a.num_rates_flags = SCMI_RATES_BY_ARRAY(ret_nb,
+ rem_nb);
+ p2a.status = SCMI_SUCCESS;
+
+ memcpy(msg->out, &p2a, sizeof(p2a));
+ msg->out_size_out = sizeof(p2a) +
+ ret_nb * RATE_DESC_SIZE;
+ }
+ } else if (status == SCMI_NOT_SUPPORTED) {
+ unsigned long triplet[3] = { 0U, 0U, 0U };
+
+ /* Platform may support min§max/step triplet description */
+ status = plat_scmi_clock_rates_by_step(msg->agent_id, clock_id,
+ triplet);
+ if (status == SCMI_SUCCESS) {
+ write_rate_desc_array_in_buffer(msg->out + sizeof(p2a),
+ triplet, 3U);
+
+ p2a.num_rates_flags = SCMI_RATES_BY_STEP;
+ p2a.status = SCMI_SUCCESS;
+
+ memcpy(msg->out, &p2a, sizeof(p2a));
+ msg->out_size_out = sizeof(p2a) + (3U * RATE_DESC_SIZE);
+ }
+ } else {
+ /* Fallthrough generic exit sequence below with error status */
+ }
+
+ if (status != SCMI_SUCCESS) {
+ scmi_status_response(msg, status);
+ } else {
+ /*
+ * Message payload is already writen to msg->out, and
+ * msg->out_size_out updated.
+ */
+ }
+}
+
+static const scmi_msg_handler_t scmi_clock_handler_table[] = {
+ [SCMI_PROTOCOL_VERSION] = report_version,
+ [SCMI_PROTOCOL_ATTRIBUTES] = report_attributes,
+ [SCMI_PROTOCOL_MESSAGE_ATTRIBUTES] = report_message_attributes,
+ [SCMI_CLOCK_ATTRIBUTES] = scmi_clock_attributes,
+ [SCMI_CLOCK_DESCRIBE_RATES] = scmi_clock_describe_rates,
+ [SCMI_CLOCK_RATE_SET] = scmi_clock_rate_set,
+ [SCMI_CLOCK_RATE_GET] = scmi_clock_rate_get,
+ [SCMI_CLOCK_CONFIG_SET] = scmi_clock_config_set,
+};
+
+static bool message_id_is_supported(size_t message_id)
+{
+ return (message_id < ARRAY_SIZE(scmi_clock_handler_table)) &&
+ (scmi_clock_handler_table[message_id] != NULL);
+}
+
+scmi_msg_handler_t scmi_msg_get_clock_handler(struct scmi_msg *msg)
+{
+ const size_t array_size = ARRAY_SIZE(scmi_clock_handler_table);
+ unsigned int message_id = SPECULATION_SAFE_VALUE(msg->message_id);
+
+ if (message_id >= array_size) {
+ VERBOSE("Clock handle not found %u", msg->message_id);
+ return NULL;
+ }
+
+ return scmi_clock_handler_table[message_id];
+}