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/*
*
* (C) COPYRIGHT 2017 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/scmi_protocol.h>
#include <linux/version.h>
static const struct scmi_handle *handle;
static int gpu_domain_id;
static struct platform_device *scmi_device;
struct platform_device *scmi_pdev;
static int scmi_gpu_opps_probe(struct platform_device *pdev)
{
struct device_node *np ;
struct platform_device *gpu_pdev;
struct device *dev = &pdev->dev;
int err;
handle = devm_scmi_handle_get(dev);
if (IS_ERR_OR_NULL(handle) || !handle->perf_ops){
return -EPROBE_DEFER;
}
np = of_find_node_by_name(NULL, "gpu");
if (!np) {
dev_err(dev, "Failed to find DT entry for Mali\n");
return -EFAULT;
}
gpu_pdev = of_find_device_by_node(np);
if (!gpu_pdev) {
dev_err(dev, "Failed to find device for Mali\n");
of_node_put(np);
return -EFAULT;
}
gpu_domain_id = handle->perf_ops->device_domain_id(&gpu_pdev->dev);
err = handle->perf_ops->add_opps_to_device(&gpu_pdev->dev);
of_node_put(np);
return err;
}
int scmi_gpu_domain_id_get(void)
{
return gpu_domain_id;
}
const struct scmi_handle *scmi_gpu_handle_get(void)
{
if (IS_ERR_OR_NULL(handle) || !handle->perf_ops)
return ERR_PTR(-EPROBE_DEFER);
return handle;
}
static struct platform_driver scmi_gpu_opp_driver = {
.driver = {
.name = "scmi_gpu_opp",
},
.probe = scmi_gpu_opps_probe,
};
static int __init scmi_gpu_opp_init (void)
{
int ret;
struct device_node *np_scmi;
np_scmi = of_find_node_by_name(NULL, "scmi");
if (!np_scmi) {
printk("Failed to find DT entry for scmi\n");
return -EPROBE_DEFER;
}
scmi_pdev = of_find_device_by_node(np_scmi);
if (!scmi_pdev) {
printk( "Failed to find device for scmi\n");
of_node_put(np_scmi);
return -EFAULT;
}
ret = platform_driver_register(&scmi_gpu_opp_driver);
if (ret)
goto exit;
scmi_device = platform_device_register_resndata(&scmi_pdev->dev,
"scmi_gpu_opp",
-1, NULL, 0, NULL, 0);
if (IS_ERR(scmi_device)) {
platform_driver_unregister(&scmi_gpu_opp_driver);
return -ENODEV;
}
exit:
return ret;
}
static void __exit scmi_gpu_opp_exit (void)
{
platform_device_unregister(scmi_device);
platform_driver_unregister(&scmi_gpu_opp_driver);
}
module_init(scmi_gpu_opp_init);
module_exit(scmi_gpu_opp_exit);
MODULE_AUTHOR("Amit Kachhap <amit.kachhap@arm.com>");
MODULE_DESCRIPTION("ARM SCMI GPU opp driver");
MODULE_LICENSE("GPL v2");
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