diff options
Diffstat (limited to 'drivers/scmi-msg/clock.c')
| -rw-r--r-- | drivers/scmi-msg/clock.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/scmi-msg/clock.c b/drivers/scmi-msg/clock.c new file mode 100644 index 0000000..5aaf68c --- /dev/null +++ b/drivers/scmi-msg/clock.c @@ -0,0 +1,383 @@ +// 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, + uint32_t start_idx __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, 0); + 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, + in_args->rate_index); + 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 written 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(unsigned int 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]; +} |