interconnect: mediatek: Add dvfsrc interconnect provider driver

Introduce Mediatek dvfsrc specific provider driver using the
interconnect framework.

Change-Id: I5da11d17cb702ee4ae9c42d0650a02cb53832f73
Signed-off-by: Arvin Wang <arvin.wang@mediatek.com>
CR-Id: ALPS04419708
Feature: VCORE DVFS

drivers/interconnect/Kconfig

@@ -11,5 +11,6 @@ menuconfig INTERCONNECT
 if INTERCONNECT
 
 source "drivers/interconnect/qcom/Kconfig"
+source "drivers/interconnect/mediatek/Kconfig"
 
 endif

drivers/interconnect/Makefile

@@ -4,3 +4,4 @@ icc-core-objs				:= core.o
 
 obj-$(CONFIG_INTERCONNECT)		+= icc-core.o
 obj-$(CONFIG_INTERCONNECT_QCOM)		+= qcom/
+obj-$(CONFIG_INTERCONNECT_MTK)		+= mediatek/

drivers/interconnect/mediatek/Kconfig

@@ -0,0 +1,17 @@
+config INTERCONNECT_MTK
+	bool "Mediatek Network-on-Chip interconnect drivers"
+	depends on ARCH_MEDIATEK
+	help
+	  Support for Mediatek's Network-on-Chip interconnect hardware.
+
+config INTERCONNECT_MTK_EMI
+	tristate "Mediatek EMI interconnect driver"
+	depends on INTERCONNECT_MTK
+	depends on (MTK_DVFSRC && OF)
+	help
+	  This is a driver for the Mediatek Network-on-Chip
+	  with DVFSRC-based platforms.
+	  The Mediatek EMI(external memory interface) Interconnect driver
+	  will aggregate require EMI BW of users to DVFSRC(dynamic voltage
+	  and frequency scaling resource collector). The DVFSRC will adjust
+	  appropriate DRAM frequency to fulfill this bandwidth request.

drivers/interconnect/mediatek/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+mtk-emi-objs			:= emi.o
+
+obj-$(CONFIG_INTERCONNECT_MTK_EMI) += mtk-emi.o

drivers/interconnect/mediatek/emi.c

@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ */
+
+#include <dt-bindings/interconnect/mtk,mt6779-emi.h>
+#include <linux/device.h>
+#include <linux/interconnect-provider.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk_dvfsrc.h>
+
+enum mtk_icc_name {
+	SLAVE_DDR_EMI,
+	MASTER_MCUSYS,
+	MASTER_GPUSYS,
+	MASTER_MMSYS,
+	MASTER_MM_VPU,
+	MASTER_MM_DISP,
+	MASTER_MM_VDEC,
+	MASTER_MM_VENC,
+	MASTER_MM_CAM,
+	MASTER_MM_IMG,
+	MASTER_MM_MDP,
+	MASTER_VPUSYS,
+	MASTER_VPU_PORT_0,
+	MASTER_VPU_PORT_1,
+	MASTER_MDLASYS,
+	MASTER_MDLA_PORT_0,
+};
+
+#define MAX_LINKS	6
+
+/**
+ * struct mtk_icc_node - Mediatek specific interconnect nodes
+ * @name: the node name used in debugfs
+ * @links: an array of nodes where we can go next while traversing
+ * @id: a unique node identifier
+ * @num_links: the total number of @links
+ * @buswidth: width of the interconnect between a node and the bus
+ * @sum_avg: current sum aggregate value of all avg bw [kBps] requests
+ * @max_peak: current max aggregate value of all peak bw [kBps] requests
+ */
+struct mtk_icc_node {
+	unsigned char *name;
+	bool ep;
+	u16 id;
+	u16 links[MAX_LINKS];
+	u16 num_links;
+	u16 buswidth;
+	u64 sum_avg;
+	u64 sum_peak;
+};
+
+struct mtk_icc_desc {
+	struct mtk_icc_node **nodes;
+	size_t num_nodes;
+};
+
+#define DEFINE_MNODE(_name, _id, _buswidth, _ep, _numlinks, ...)	\
+		static struct mtk_icc_node _name = {			\
+		.name = #_name,						\
+		.id = _id,						\
+		.buswidth = _buswidth,					\
+		.ep = _ep,						\
+		.num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })),	\
+		.links = { __VA_ARGS__ },				\
+}
+
+DEFINE_MNODE(ddr_emi, SLAVE_DDR_EMI, 1024, 1, 0, 0);
+DEFINE_MNODE(mcusys, MASTER_MCUSYS, 256, 0, 1, SLAVE_DDR_EMI);
+DEFINE_MNODE(gpu, MASTER_GPUSYS, 256, 0, 1, SLAVE_DDR_EMI);
+DEFINE_MNODE(mmsys, MASTER_MMSYS, 256, 0, 1, SLAVE_DDR_EMI);
+DEFINE_MNODE(mm_vpu, MASTER_MM_VPU, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_disp, MASTER_MM_DISP, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_vdec, MASTER_MM_VDEC, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_venc, MASTER_MM_VENC, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_cam, MASTER_MM_CAM, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_img, MASTER_MM_IMG, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(mm_mdp, MASTER_MM_MDP, 128, 0, 1, MASTER_MMSYS);
+DEFINE_MNODE(vpusys, MASTER_VPUSYS, 256, 0, 1, SLAVE_DDR_EMI);
+DEFINE_MNODE(vpu_port_0, MASTER_VPU_PORT_0, 128, 0, 1, MASTER_VPUSYS);
+DEFINE_MNODE(vpu_port_1, MASTER_VPU_PORT_1, 128, 0, 1, MASTER_VPUSYS);
+DEFINE_MNODE(mdlasys, MASTER_MDLASYS, 256, 0, 1, SLAVE_DDR_EMI);
+DEFINE_MNODE(mdla_port_0, MASTER_MDLA_PORT_0, 256, 0, 1, MASTER_MDLASYS);
+
+
+static struct mtk_icc_node *mt6779_icc_nodes[] = {
+	[MT6779_SLAVE_DDR_EMI] = &ddr_emi,
+	[MT6779_MASTER_MCUSYS] = &mcusys,
+	[MT6779_MASTER_GPU]	 = &gpu,
+	[MT6779_MASTER_MMSYS]	 = &mmsys,
+	[MT6779_MASTER_MM_VPU] = &mm_vpu,
+	[MT6779_MASTER_MM_DISP] = &mm_disp,
+	[MT6779_MASTER_MM_VDEC] = &mm_vdec,
+	[MT6779_MASTER_MM_VENC] = &mm_venc,
+	[MT6779_MASTER_MM_CAM] = &mm_cam,
+	[MT6779_MASTER_MM_IMG] = &mm_img,
+	[MT6779_MASTER_MM_MDP] = &mm_mdp,
+	[MT6779_MASTER_VPUSYS] = &vpusys,
+	[MT6779_MASTER_VPU_0]	= &vpu_port_0,
+	[MT6779_MASTER_VPU_1]	= &vpu_port_1,
+	[MT6779_MASTER_MDLASYS] = &mdlasys,
+	[MT6779_MASTER_MDLA_0] = &mdla_port_0,
+};
+
+static struct mtk_icc_desc mt6779_icc = {
+	.nodes = mt6779_icc_nodes,
+	.num_nodes = ARRAY_SIZE(mt6779_icc_nodes),
+};
+
+static int emi_icc_aggregate(struct icc_node *node, u32 avg_bw,
+			      u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
+{
+	struct mtk_icc_node *in;
+
+	in = node->data;
+
+	*agg_avg  += avg_bw;
+	*agg_peak += peak_bw;
+
+	in->sum_avg = *agg_avg;
+	in->sum_peak = *agg_peak;
+
+	return 0;
+}
+
+static int emi_icc_set(struct icc_node *src, struct icc_node *dst)
+{
+	int ret = 0;
+	struct mtk_icc_node *node;
+
+	node = dst->data;
+	if (node->ep) {
+		pr_debug("sum_avg (%llu), max_peak (%llu)\n",
+			node->sum_avg, node->sum_peak);
+		mtk_dvfsrc_send_request(src->provider->dev->parent,
+					MTK_DVFSRC_CMD_BW_REQUEST,
+					node->sum_avg);
+		mtk_dvfsrc_send_request(src->provider->dev->parent,
+					MTK_DVFSRC_CMD_HRTBW_REQUEST,
+					node->sum_peak);
+	}
+
+	return ret;
+}
+
+static int emi_icc_probe(struct platform_device *pdev)
+{
+	int ret;
+	const struct mtk_icc_desc *desc;
+	struct icc_node *node;
+	struct icc_onecell_data *data;
+	struct icc_provider *provider;
+	struct mtk_icc_node **mnodes;
+	size_t num_nodes, i, j;
+
+	desc = of_device_get_match_data(&pdev->dev);
+	if (!desc)
+		return -EINVAL;
+
+	mnodes = desc->nodes;
+	num_nodes = desc->num_nodes;
+
+	provider = devm_kzalloc(&pdev->dev, sizeof(*provider), GFP_KERNEL);
+	if (!provider)
+		return -ENOMEM;
+
+	data = devm_kcalloc(&pdev->dev, num_nodes, sizeof(*node), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	provider->dev = &pdev->dev;
+	provider->set = emi_icc_set;
+	provider->aggregate = emi_icc_aggregate;
+	provider->xlate = of_icc_xlate_onecell;
+	INIT_LIST_HEAD(&provider->nodes);
+	provider->data = data;
+
+	ret = icc_provider_add(provider);
+	if (ret) {
+		dev_err(&pdev->dev, "error adding interconnect provider\n");
+		return ret;
+	}
+
+	for (i = 0; i < num_nodes; i++) {
+		node = icc_node_create(mnodes[i]->id);
+		if (IS_ERR(node)) {
+			ret = PTR_ERR(node);
+			goto err;
+		}
+
+		node->name = mnodes[i]->name;
+		node->data = mnodes[i];
+		icc_node_add(node, provider);
+
+		dev_dbg(&pdev->dev, "registered node %s, num link: %d\n",
+			mnodes[i]->name, mnodes[i]->num_links);
+
+		/* populate links */
+		for (j = 0; j < mnodes[i]->num_links; j++)
+			icc_link_create(node, mnodes[i]->links[j]);
+
+		data->nodes[i] = node;
+	}
+	data->num_nodes = num_nodes;
+
+	platform_set_drvdata(pdev, provider);
+
+	return 0;
+err:
+	list_for_each_entry(node, &provider->nodes, node_list) {
+		icc_node_del(node);
+		icc_node_destroy(node->id);
+	}
+
+	icc_provider_del(provider);
+	return ret;
+}
+
+static int emi_icc_remove(struct platform_device *pdev)
+{
+	struct icc_provider *provider = platform_get_drvdata(pdev);
+	struct icc_node *n;
+
+	list_for_each_entry(n, &provider->nodes, node_list) {
+		icc_node_del(n);
+		icc_node_destroy(n->id);
+	}
+
+	return icc_provider_del(provider);
+}
+
+static const struct of_device_id emi_icc_of_match[] = {
+	{ .compatible = "mediatek,mt6779-emi", .data = &mt6779_icc },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, emi_icc_of_match);
+
+static struct platform_driver emi_icc_driver = {
+	.probe = emi_icc_probe,
+	.remove = emi_icc_remove,
+	.driver = {
+		.name = "mediatek-emi-icc",
+		.of_match_table = emi_icc_of_match,
+	},
+};
+module_platform_driver(emi_icc_driver);
+
+MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
+MODULE_LICENSE("GPL v2");