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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-21 GuEe-GUI first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <drivers/scmi.h>
#define DBG_TAG "dvfs.scmi.cpufreq"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct scmi_cpufreq
{
struct rt_scmi_device *sdev;
int domain_id;
struct rt_dvfs_cpufreq cpufreq;
};
static rt_err_t scmi_perf_level_set(struct scmi_cpufreq *scmi_cpufreq, rt_uint64_t level)
{
struct scmi_perf_level_set_in in =
{
.flags = rt_cpu_to_le32(0),
.domain = rt_cpu_to_le32(scmi_cpufreq->domain_id),
.level_lsb = rt_cpu_to_le32((rt_uint32_t)level),
.level_msb = rt_cpu_to_le32((rt_uint32_t)(level >> 32)),
};
struct scmi_perf_level_set_out out;
struct rt_scmi_msg msg = RT_SCMI_MSG_IN_OUT(SCMI_PERF_LEVEL_SET, &in, &out);
return rt_scmi_process_msg(scmi_cpufreq->sdev, &msg);
}
static rt_err_t scmi_cpufreq_set_opp(struct rt_dvfs_scaling *scaling, struct rt_dvfs_opp *opp)
{
struct rt_dvfs_devfreq *devfreq = rt_container_of(scaling, struct rt_dvfs_devfreq, parent);
struct scmi_cpufreq *scmi_cpufreq = rt_container_of(devfreq, struct scmi_cpufreq, cpufreq.parent);
if (!opp)
{
return -RT_EINVAL;
}
return scmi_perf_level_set(scmi_cpufreq, opp->freq);
}
static rt_err_t scmi_cpufreq_add_opps(struct scmi_cpufreq *scmi_cpufreq)
{
struct rt_dvfs_scaling *dvfs = rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq);
struct scmi_perf_describe_levels_in in =
{
.domain = rt_cpu_to_le32(scmi_cpufreq->domain_id),
.level_index = rt_cpu_to_le32(0),
};
struct scmi_perf_describe_levels_out *out;
rt_size_t out_size = sizeof(*out) + sizeof(struct scmi_perf_level) * SCMI_MAX_NUM_RATES;
rt_err_t err;
rt_uint32_t i, num_levels;
out = rt_calloc(1, out_size);
if (!out)
{
return -RT_ENOMEM;
}
do
{
struct rt_scmi_msg msg = RT_SCMI_MSG_RAW(SCMI_PERF_DESCRIBE_LEVELS,
&in, sizeof(in), out, out_size);
err = rt_scmi_process_msg(scmi_cpufreq->sdev, &msg);
if (err)
{
break;
}
num_levels = rt_le32_to_cpu(out->num_levels) & 0xfff;
for (i = 0; i < num_levels; ++i)
{
rt_uint64_t hz = SCMI_PERF_LEVEL_TO_U64(out->level[i]);
struct rt_dvfs_opp *opp;
if (!hz)
{
continue;
}
opp = rt_dvfs_scaling_add_opp(dvfs, (rt_ubase_t)hz, 0);
if (opp)
{
opp->available = RT_TRUE;
opp->power = rt_le32_to_cpu(out->level[i].power) / 1000;
}
}
in.level_index = rt_cpu_to_le32(rt_le32_to_cpu(in.level_index) + num_levels);
} while ((rt_le32_to_cpu(out->num_levels) >> 16) > 0);
rt_free(out);
return err;
}
static struct rt_dvfs_scaling_ops scmi_cpufreq_ops =
{
.set_opp = scmi_cpufreq_set_opp,
};
static rt_err_t scmi_cpufreq_probe(struct rt_scmi_device *sdev)
{
struct scmi_cpufreq *scmi_cpufreq;
struct scmi_perf_attributes attr;
struct rt_scmi_msg msg = RT_SCMI_MSG_OUT(SCMI_COM_MSG_ATTRIBUTES, &attr);
rt_err_t err;
int domain;
if ((err = rt_scmi_process_msg(sdev, &msg)))
{
LOG_E("Get SCMI perf attributes failed: %s", rt_strerror(err));
return err;
}
if (!(scmi_cpufreq = rt_calloc(1, sizeof(*scmi_cpufreq))))
{
return -RT_ENOMEM;
}
scmi_cpufreq->sdev = sdev;
for (domain = 0; domain < rt_le16_to_cpu(attr.num_domains); ++domain)
{
struct scmi_perf_domain_attr_in domain_in =
{
.domain = rt_cpu_to_le32(domain),
};
struct scmi_perf_domain_attr_out domain_out;
struct rt_scmi_msg domain_msg = RT_SCMI_MSG_IN_OUT(SCMI_PERF_DOMAIN_ATTRIBUTES,
&domain_in, &domain_out);
rt_memset(&scmi_cpufreq->cpufreq, 0, sizeof(scmi_cpufreq->cpufreq));
if ((err = rt_scmi_process_msg(sdev, &domain_msg)))
{
continue;
}
scmi_cpufreq->domain_id = domain;
rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq)->ops = &scmi_cpufreq_ops;
rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq)->dev = &sdev->parent;
scmi_cpufreq->cpufreq.master_cpu = 0;
if ((err = scmi_cpufreq_add_opps(scmi_cpufreq)))
{
LOG_W("Domain %d: add OPPs failed: %s", domain, rt_strerror(err));
rt_dvfs_scaling_remove_opp_all(rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq));
continue;
}
if ((err = rt_dvfs_cpufreq_register(&scmi_cpufreq->cpufreq)))
{
LOG_E("Domain %d: register cpufreq failed: %s", domain, rt_strerror(err));
rt_dvfs_scaling_remove_opp_all(rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq));
continue;
}
err = rt_dvfs_scaling_set_governor(rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq),
RT_DVFS_GOVERNOR_TYPE_ONDEMAND);
if (err)
{
rt_dvfs_scaling_set_governor(rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq),
RT_DVFS_GOVERNOR_TYPE_PERFORMANCE);
}
LOG_D("SCMI cpufreq domain %d registered, freq range: %lu-%lu Hz",
domain,
rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq)->min_freq,
rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq)->max_freq);
sdev->parent.user_data = scmi_cpufreq;
return RT_EOK;
}
rt_free(scmi_cpufreq);
return -RT_ENOSYS;
}
static rt_err_t scmi_cpufreq_remove(struct rt_scmi_device *sdev)
{
struct scmi_cpufreq *scmi_cpufreq = sdev->parent.user_data;
if (scmi_cpufreq)
{
rt_dvfs_cpufreq_unregister(&scmi_cpufreq->cpufreq);
rt_dvfs_scaling_remove_opp_all(rt_dvfs_cpufreq_to_scaling(&scmi_cpufreq->cpufreq));
rt_free(scmi_cpufreq);
sdev->parent.user_data = RT_NULL;
}
return RT_EOK;
}
static const struct rt_scmi_device_id scmi_cpufreq_ids[] =
{
{ SCMI_PROTOCOL_ID_PERF, "cpufreq" },
{ 0, RT_NULL },
};
static struct rt_scmi_driver scmi_cpufreq_driver =
{
.name = "scmi-cpufreq",
.ids = scmi_cpufreq_ids,
.probe = scmi_cpufreq_probe,
.remove = scmi_cpufreq_remove,
};
static int scmi_cpufreq_init(void)
{
rt_scmi_driver_register(&scmi_cpufreq_driver);
return 0;
}
INIT_DEVICE_EXPORT(scmi_cpufreq_init);
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