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-rw-r--r--drivers/interconnect/imx/imx.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/interconnect/imx/imx.c b/drivers/interconnect/imx/imx.c
new file mode 100644
index 000000000..979ed610f
--- /dev/null
+++ b/drivers/interconnect/imx/imx.c
@@ -0,0 +1,337 @@
+// 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 <abailon@baylibre.com>
+ * Author: Leonard Crestez <leonard.crestez@nxp.com>
+ */
+
+#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_LICENSE("GPL v2");