// SPDX-License-Identifier: GPL-2.0
/*
* Interconnect framework driver for i.MX SoC
*
* Copyright (c) 2019, BayLibre
* Copyright (c) 2019-2020, NXP
* Author: Alexandre Bailon <[email protected]>
* Author: Leonard Crestez <[email protected]>
*/
#include <linux/device.h>
#include <linux/interconnect-provider.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include "imx.h"
/* private icc_node data */
struct imx_icc_node {
const struct imx_icc_node_desc *desc;
const struct imx_icc_noc_setting *setting;
struct device *qos_dev;
struct dev_pm_qos_request qos_req;
struct imx_icc_provider *imx_provider;
};
static int imx_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
{
*avg = 0;
*peak = 0;
return 0;
}
static int imx_icc_node_set(struct icc_node *node)
{
struct device *dev = node->provider->dev;
struct imx_icc_node *node_data = node->data;
void __iomem *base;
u32 prio;
u64 freq;
if (node_data->setting && node->peak_bw) {
base = node_data->setting->reg + node_data->imx_provider->noc_base;
if (node_data->setting->mode == IMX_NOC_MODE_FIXED) {
prio = node_data->setting->prio_level;
prio = PRIORITY_COMP_MARK | (prio << 8) | prio;
writel(prio, base + IMX_NOC_PRIO_REG);
writel(node_data->setting->mode, base + IMX_NOC_MODE_REG);
writel(node_data->setting->ext_control, base + IMX_NOC_EXT_CTL_REG);
dev_dbg(dev, "%s: mode: 0x%x, prio: 0x%x, ext_control: 0x%x\n",
node_data->desc->name, node_data->setting->mode, prio,
node_data->setting->ext_control);
} else if (node_data->setting->mode == IMX_NOC_MODE_UNCONFIGURED) {
dev_dbg(dev, "%s: mode not unconfigured\n", node_data->desc->name);
} else {
dev_info(dev, "%s: mode: %d not supported\n",
node_data->desc->name, node_data->setting->mode);
return -EOPNOTSUPP;
}
}
if (!node_data->qos_dev)
return 0;
freq = (node->avg_bw + node->peak_bw) * node_data->desc->adj->bw_mul;
do_div(freq, node_data->desc->adj->bw_div);
dev_dbg(dev, "node %s device %s avg_bw %ukBps peak_bw %ukBps min_freq %llukHz\n",
node->name, dev_name(node_data->qos_dev),
node->avg_bw, node->peak_bw, freq);
if (freq > S32_MAX) {
dev_err(dev, "%s can't request more than S32_MAX freq\n",
node->name);
return -ERANGE;
}
dev_pm_qos_update_request(&node_data->qos_req, freq);
return 0;
}
static int imx_icc_set(struct icc_node *src, struct icc_node *dst)
{
int ret;
ret = imx_icc_node_set(src);
if (ret)
return ret;
return imx_icc_node_set(dst);
}
/* imx_icc_node_destroy() - Destroy an imx icc_node, including private data */
static void imx_icc_node_destroy(struct icc_node *node)
{
struct imx_icc_node *node_data = node->data;
int ret;
if (dev_pm_qos_request_active(&node_data->qos_req)) {
ret = dev_pm_qos_remove_request(&node_data->qos_req);
if (ret)
dev_warn(node->provider->dev,
"failed to remove qos request for %s\n",
dev_name(node_data->qos_dev));
}
put_device(node_data->qos_dev);
icc_node_del(node);
icc_node_destroy(node->id);
}
static int imx_icc_node_init_qos(struct icc_provider *provider,
struct icc_node *node)
{
struct imx_icc_node *node_data = node->data;
const struct imx_icc_node_adj_desc *adj = node_data->desc->adj;
struct device *dev = provider->dev;
struct device_node *dn = NULL;
struct platform_device *pdev;
if (adj->main_noc) {
node_data->qos_dev = dev;
dev_dbg(dev, "icc node %s[%d] is main noc itself\n",
node->name, node->id);
} else {
dn = of_parse_phandle(dev->of_node, adj->phandle_name, 0);
if (!dn) {
dev_warn(dev, "Failed to parse %s\n",
adj->phandle_name);
return -ENODEV;
}
/* Allow scaling to be disabled on a per-node basis */
if (!of_device_is_available(dn)) {
dev_warn(dev, "Missing property %s, skip scaling %s\n",
adj->phandle_name, node->name);
of_node_put(dn);
return 0;
}
pdev = of_find_device_by_node(dn);
of_node_put(dn);
if (!pdev) {
dev_warn(dev, "node %s[%d] missing device for %pOF\n",
node->name, node->id, dn);
return -EPROBE_DEFER;
}
node_data->qos_dev = &pdev->dev;
dev_dbg(dev, "node %s[%d] has device node %pOF\n",
node->name, node->id, dn);
}
return dev_pm_qos_add_request(node_data->qos_dev,
&node_data->qos_req,
DEV_PM_QOS_MIN_FREQUENCY, 0);
}
static struct icc_node *imx_icc_node_add(struct imx_icc_provider *imx_provider,
const struct imx_icc_node_desc *node_desc,
const struct imx_icc_noc_setting *setting)
{
struct icc_provider *provider = &imx_provider->provider;
struct device *dev = provider->dev;
struct imx_icc_node *node_data;
struct icc_node *node;
int ret;
node = icc_node_create(node_desc->id);
if (IS_ERR(node)) {
dev_err(dev, "failed to create node %d\n", node_desc->id);
return node;
}
if (node->data) {
dev_err(dev, "already created node %s id=%d\n",
node_desc->name, node_desc->id);
return ERR_PTR(-EEXIST);
}
node_data = devm_kzalloc(dev, sizeof(*node_data), GFP_KERNEL);
if (!node_data) {
icc_node_destroy(node->id);
return ERR_PTR(-ENOMEM);
}
node->name = node_desc->name;
node->data = node_data;
node_data->desc = node_desc;
node_data->setting = setting;
node_data->imx_provider = imx_provider;
icc_node_add(node, provider);
if (node_desc->adj) {
ret = imx_icc_node_init_qos(provider, node);
if (ret < 0) {
imx_icc_node_destroy(node);
return ERR_PTR(ret);
}
}
return node;
}
static void imx_icc_unregister_nodes(struct icc_provider *provider)
{
struct icc_node *node, *tmp;
list_for_each_entry_safe(node, tmp, &provider->nodes, node_list)
imx_icc_node_destroy(node);
}
static int imx_icc_register_nodes(struct imx_icc_provider *imx_provider,
const struct imx_icc_node_desc *descs,
int count,
const struct imx_icc_noc_setting *settings)
{
struct icc_provider *provider = &imx_provider->provider;
struct icc_onecell_data *provider_data = provider->data;
int ret;
int i;
for (i = 0; i < count; i++) {
struct icc_node *node;
const struct imx_icc_node_desc *node_desc = &descs[i];
size_t j;
node = imx_icc_node_add(imx_provider, node_desc,
settings ? &settings[node_desc->id] : NULL);
if (IS_ERR(node)) {
ret = dev_err_probe(provider->dev, PTR_ERR(node),
"failed to add %s\n", node_desc->name);
goto err;
}
provider_data->nodes[node->id] = node;
for (j = 0; j < node_desc->num_links; j++) {
ret = icc_link_create(node, node_desc->links[j]);
if (ret) {
dev_err(provider->dev, "failed to link node %d to %d: %d\n",
node->id, node_desc->links[j], ret);
goto err;
}
}
}
return 0;
err:
imx_icc_unregister_nodes(provider);
return ret;
}
static int get_max_node_id(struct imx_icc_node_desc *nodes, int nodes_count)
{
int i, ret = 0;
for (i = 0; i < nodes_count; ++i)
if (nodes[i].id > ret)
ret = nodes[i].id;
return ret;
}
int imx_icc_register(struct platform_device *pdev,
struct imx_icc_node_desc *nodes, int nodes_count,
struct imx_icc_noc_setting *settings)
{
struct device *dev = &pdev->dev;
struct icc_onecell_data *data;
struct imx_icc_provider *imx_provider;
struct icc_provider *provider;
int num_nodes;
int ret;
/* icc_onecell_data is indexed by node_id, unlike nodes param */
num_nodes = get_max_node_id(nodes, nodes_count) + 1;
data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
GFP_KERNEL);
if (!data)
return -ENOMEM;
data->num_nodes = num_nodes;
imx_provider = devm_kzalloc(dev, sizeof(*imx_provider), GFP_KERNEL);
if (!imx_provider)
return -ENOMEM;
provider = &imx_provider->provider;
provider->set = imx_icc_set;
provider->get_bw = imx_icc_get_bw;
provider->aggregate = icc_std_aggregate;
provider->xlate = of_icc_xlate_onecell;
provider->data = data;
provider->dev = dev->parent;
icc_provider_init(provider);
platform_set_drvdata(pdev, imx_provider);
if (settings) {
imx_provider->noc_base = devm_of_iomap(dev, provider->dev->of_node, 0, NULL);
if (IS_ERR(imx_provider->noc_base)) {
ret = PTR_ERR(imx_provider->noc_base);
dev_err(dev, "Error mapping NoC: %d\n", ret);
return ret;
}
}
ret = imx_icc_register_nodes(imx_provider, nodes, nodes_count, settings);
if (ret)
return ret;
ret = icc_provider_register(provider);
if (ret)
goto err_unregister_nodes;
return 0;
err_unregister_nodes:
imx_icc_unregister_nodes(&imx_provider->provider);
return ret;
}
EXPORT_SYMBOL_GPL(imx_icc_register);
void imx_icc_unregister(struct platform_device *pdev)
{
struct imx_icc_provider *imx_provider = platform_get_drvdata(pdev);
icc_provider_deregister(&imx_provider->provider);
imx_icc_unregister_nodes(&imx_provider->provider);
}
EXPORT_SYMBOL_GPL(imx_icc_unregister);
MODULE_DESCRIPTION("Interconnect framework driver for i.MX SoC");
MODULE_LICENSE("GPL v2");
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