mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Johan Hovold](/assets/img/avatar_default.png)
There is no longer any need to explicitly destroy node links as this is now done when the node is destroyed as part of icc_nodes_remove(). Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Link: https://lore.kernel.org/r/20230306075651.2449-17-johan+linaro@kernel.org Signed-off-by: Georgi Djakov <djakov@kernel.org>
193 lines
4.7 KiB
C
193 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Exynos generic interconnect provider driver
|
|
*
|
|
* Copyright (c) 2020 Samsung Electronics Co., Ltd.
|
|
*
|
|
* Authors: Artur Świgoń <a.swigon@samsung.com>
|
|
* Sylwester Nawrocki <s.nawrocki@samsung.com>
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/interconnect-provider.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_qos.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO 8
|
|
|
|
struct exynos_icc_priv {
|
|
struct device *dev;
|
|
|
|
/* One interconnect node per provider */
|
|
struct icc_provider provider;
|
|
struct icc_node *node;
|
|
|
|
struct dev_pm_qos_request qos_req;
|
|
u32 bus_clk_ratio;
|
|
};
|
|
|
|
static struct icc_node *exynos_icc_get_parent(struct device_node *np)
|
|
{
|
|
struct of_phandle_args args;
|
|
struct icc_node_data *icc_node_data;
|
|
struct icc_node *icc_node;
|
|
int num, ret;
|
|
|
|
num = of_count_phandle_with_args(np, "interconnects",
|
|
"#interconnect-cells");
|
|
if (num < 1)
|
|
return NULL; /* parent nodes are optional */
|
|
|
|
/* Get the interconnect target node */
|
|
ret = of_parse_phandle_with_args(np, "interconnects",
|
|
"#interconnect-cells", 0, &args);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
icc_node_data = of_icc_get_from_provider(&args);
|
|
of_node_put(args.np);
|
|
|
|
if (IS_ERR(icc_node_data))
|
|
return ERR_CAST(icc_node_data);
|
|
|
|
icc_node = icc_node_data->node;
|
|
kfree(icc_node_data);
|
|
|
|
return icc_node;
|
|
}
|
|
|
|
static int exynos_generic_icc_set(struct icc_node *src, struct icc_node *dst)
|
|
{
|
|
struct exynos_icc_priv *src_priv = src->data, *dst_priv = dst->data;
|
|
s32 src_freq = max(src->avg_bw, src->peak_bw) / src_priv->bus_clk_ratio;
|
|
s32 dst_freq = max(dst->avg_bw, dst->peak_bw) / dst_priv->bus_clk_ratio;
|
|
int ret;
|
|
|
|
ret = dev_pm_qos_update_request(&src_priv->qos_req, src_freq);
|
|
if (ret < 0) {
|
|
dev_err(src_priv->dev, "failed to update PM QoS of %s (src)\n",
|
|
src->name);
|
|
return ret;
|
|
}
|
|
|
|
ret = dev_pm_qos_update_request(&dst_priv->qos_req, dst_freq);
|
|
if (ret < 0) {
|
|
dev_err(dst_priv->dev, "failed to update PM QoS of %s (dst)\n",
|
|
dst->name);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct icc_node *exynos_generic_icc_xlate(struct of_phandle_args *spec,
|
|
void *data)
|
|
{
|
|
struct exynos_icc_priv *priv = data;
|
|
|
|
if (spec->np != priv->dev->parent->of_node)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return priv->node;
|
|
}
|
|
|
|
static int exynos_generic_icc_remove(struct platform_device *pdev)
|
|
{
|
|
struct exynos_icc_priv *priv = platform_get_drvdata(pdev);
|
|
|
|
icc_provider_deregister(&priv->provider);
|
|
icc_nodes_remove(&priv->provider);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int exynos_generic_icc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *bus_dev = pdev->dev.parent;
|
|
struct exynos_icc_priv *priv;
|
|
struct icc_provider *provider;
|
|
struct icc_node *icc_node, *icc_parent_node;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
provider = &priv->provider;
|
|
|
|
provider->set = exynos_generic_icc_set;
|
|
provider->aggregate = icc_std_aggregate;
|
|
provider->xlate = exynos_generic_icc_xlate;
|
|
provider->dev = bus_dev;
|
|
provider->inter_set = true;
|
|
provider->data = priv;
|
|
|
|
icc_provider_init(provider);
|
|
|
|
icc_node = icc_node_create(pdev->id);
|
|
if (IS_ERR(icc_node))
|
|
return PTR_ERR(icc_node);
|
|
|
|
priv->node = icc_node;
|
|
icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn",
|
|
bus_dev->of_node);
|
|
if (of_property_read_u32(bus_dev->of_node, "samsung,data-clock-ratio",
|
|
&priv->bus_clk_ratio))
|
|
priv->bus_clk_ratio = EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO;
|
|
|
|
icc_node->data = priv;
|
|
icc_node_add(icc_node, provider);
|
|
|
|
/*
|
|
* Register a PM QoS request for the parent (devfreq) device.
|
|
*/
|
|
ret = dev_pm_qos_add_request(bus_dev, &priv->qos_req,
|
|
DEV_PM_QOS_MIN_FREQUENCY, 0);
|
|
if (ret < 0)
|
|
goto err_node_del;
|
|
|
|
icc_parent_node = exynos_icc_get_parent(bus_dev->of_node);
|
|
if (IS_ERR(icc_parent_node)) {
|
|
ret = PTR_ERR(icc_parent_node);
|
|
goto err_pmqos_del;
|
|
}
|
|
if (icc_parent_node) {
|
|
ret = icc_link_create(icc_node, icc_parent_node->id);
|
|
if (ret < 0)
|
|
goto err_pmqos_del;
|
|
}
|
|
|
|
ret = icc_provider_register(provider);
|
|
if (ret < 0)
|
|
goto err_pmqos_del;
|
|
|
|
return 0;
|
|
|
|
err_pmqos_del:
|
|
dev_pm_qos_remove_request(&priv->qos_req);
|
|
err_node_del:
|
|
icc_nodes_remove(provider);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver exynos_generic_icc_driver = {
|
|
.driver = {
|
|
.name = "exynos-generic-icc",
|
|
.sync_state = icc_sync_state,
|
|
},
|
|
.probe = exynos_generic_icc_probe,
|
|
.remove = exynos_generic_icc_remove,
|
|
};
|
|
module_platform_driver(exynos_generic_icc_driver);
|
|
|
|
MODULE_DESCRIPTION("Exynos generic interconnect driver");
|
|
MODULE_AUTHOR("Artur Świgoń <a.swigon@samsung.com>");
|
|
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:exynos-generic-icc");
|