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