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From:   Tinghan Shen <tinghan.shen@mediatek.com>
To:     Bjorn Andersson <andersson@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Tinghan Shen <tinghan.shen@mediatek.com>
CC:     <linux-remoteproc@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@mediatek.com>
Subject: [PATCH v9 06/11] remoteproc: mediatek: Probe multi-core SCP
Date:   Tue, 28 Mar 2023 10:27:28 +0800
Message-ID: <20230328022733.29910-7-tinghan.shen@mediatek.com>
In-Reply-To: <20230328022733.29910-1-tinghan.shen@mediatek.com>
References: <20230328022733.29910-1-tinghan.shen@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

The difference of single-core SCP and multi-core SCP device tree is
the presence of child device nodes described SCP cores. The SCP
driver populates the platform device and checks the child nodes
to identify whether it's a single-core SCP or a multi-core SCP.

Add the remoteproc instances for single-core SCP and multi-core SCP to
the new added SCP cluster list. When the SCP driver is removed, it
cleanup resources by walking through the cluster list.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_common.h |   3 +
 drivers/remoteproc/mtk_scp.c    | 150 ++++++++++++++++++++++++++++----
 2 files changed, 137 insertions(+), 16 deletions(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index c0905aec3b4b..b73b60c22ea1 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -128,6 +128,9 @@ struct mtk_scp {
 	size_t dram_size;
 
 	struct rproc_subdev *rpmsg_subdev;
+
+	struct list_head elem;
+	struct list_head *cluster;
 };
 
 /**
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 32ecd1450c6f..71882ed31e16 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -30,6 +30,8 @@ struct mtk_scp_of_regs {
 	phys_addr_t l1tcm_phys;
 };
 
+static struct list_head cluster_cores;
+
 /**
  * scp_get() - get a reference to SCP.
  *
@@ -863,7 +865,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
 }
 
 static int scp_rproc_init(struct platform_device *pdev,
-			  struct mtk_scp_of_regs *of_regs)
+			  struct mtk_scp_of_regs *of_regs,
+			  const struct mtk_scp_of_data *of_data)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
@@ -884,7 +887,7 @@ static int scp_rproc_init(struct platform_device *pdev,
 	scp = (struct mtk_scp *)rproc->priv;
 	scp->rproc = rproc;
 	scp->dev = dev;
-	scp->data = of_device_get_match_data(dev);
+	scp->data = of_data;
 	platform_set_drvdata(pdev, scp);
 
 	scp->reg_base = of_regs->reg_base;
@@ -934,10 +937,6 @@ static int scp_rproc_init(struct platform_device *pdev,
 		goto remove_subdev;
 	}
 
-	ret = rproc_add(rproc);
-	if (ret)
-		goto remove_subdev;
-
 	return 0;
 
 remove_subdev:
@@ -952,6 +951,109 @@ static int scp_rproc_init(struct platform_device *pdev,
 	return ret;
 }
 
+static void scp_rproc_free(struct mtk_scp *scp)
+{
+	int i;
+
+	scp_remove_rpmsg_subdev(scp);
+	scp_ipi_unregister(scp, SCP_IPI_INIT);
+	scp_unmap_memory_region(scp);
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_destroy(&scp->ipi_desc[i].lock);
+	mutex_destroy(&scp->send_lock);
+}
+
+static int scp_cluster_init(struct platform_device *pdev,
+			    struct mtk_scp_of_regs *of_regs)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev_of_node(dev);
+	struct platform_device *cpdev;
+	struct device_node *child;
+	const struct mtk_scp_of_data **cluster_of_data;
+	struct list_head *cluster = &cluster_cores;
+	struct mtk_scp *scp, *temp;
+	int core_id = 0, num_cores;
+	int ret;
+
+	child = of_get_next_available_child(np, NULL);
+	if (!child)
+		return dev_err_probe(dev, -ENODEV, "No child node\n");
+
+	of_node_put(child);
+	if (of_node_name_eq(child, "cros-ec-rpmsg")) {
+		dev_dbg(dev, "single-core scp\n");
+
+		ret = scp_rproc_init(pdev, of_regs, of_device_get_match_data(dev));
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to initialize single-core scp\n");
+
+		/* the single-core drvdata is intended to be the mtk_scp object.
+		 * the mtk_scp object is used by APIs in mtk_scp_rpmsg_info.
+		 */
+		scp = platform_get_drvdata(pdev);
+		list_add_tail(&scp->elem, cluster);
+		scp->cluster = cluster;
+	} else {
+		dev_dbg(dev, "multi-core scp\n");
+
+		cluster_of_data = (const struct mtk_scp_of_data **)of_device_get_match_data(dev);
+
+		num_cores = of_get_available_child_count(np);
+
+		for_each_available_child_of_node(np, child) {
+			if (core_id >= num_cores || !cluster_of_data[core_id]) {
+				ret = -EINVAL;
+				dev_err(dev, "Not support core %d\n", core_id);
+				of_node_put(child);
+				goto init_fail;
+			}
+
+			cpdev = of_find_device_by_node(child);
+			if (!cpdev) {
+				ret = -ENODEV;
+				dev_err(dev, "Not found platform device for core %d\n", core_id);
+				of_node_put(child);
+				goto init_fail;
+			}
+
+			ret = scp_rproc_init(cpdev, of_regs, cluster_of_data[core_id]);
+			if (ret) {
+				dev_err(dev, "Failed to initialize core %d rproc\n", core_id);
+				put_device(&cpdev->dev);
+				of_node_put(child);
+				goto init_fail;
+			}
+			scp = platform_get_drvdata(cpdev);
+			list_add_tail(&scp->elem, cluster);
+			scp->cluster = cluster;
+			put_device(&cpdev->dev);
+
+			core_id++;
+		}
+	}
+
+	list_for_each_entry_safe_reverse(scp, temp, cluster, elem) {
+		ret = rproc_add(scp->rproc);
+		if (ret)
+			goto add_fail;
+	}
+
+	return 0;
+
+add_fail:
+	list_for_each_entry_continue(scp, cluster, elem) {
+		rproc_del(scp->rproc);
+	}
+init_fail:
+	list_for_each_entry_safe_reverse(scp, temp, cluster, elem) {
+		list_del(&scp->elem);
+		scp_rproc_free(scp);
+	}
+
+	return ret;
+}
+
 static int scp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -980,21 +1082,30 @@ static int scp_probe(struct platform_device *pdev)
 		scp_regs.l1tcm_phys = res->start;
 	}
 
-	return scp_rproc_init(pdev, &scp_regs);
+	ret = devm_of_platform_populate(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to populate platform devices\n");
+
+	INIT_LIST_HEAD(&cluster_cores);
+	platform_set_drvdata(pdev, &cluster_cores);
+
+	ret = scp_cluster_init(pdev, &scp_regs);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize scp cluster\n");
+
+	return 0;
 }
 
 static int scp_remove(struct platform_device *pdev)
 {
-	struct mtk_scp *scp = platform_get_drvdata(pdev);
-	int i;
+	struct list_head *cluster = &cluster_cores;
+	struct mtk_scp *scp, *temp;
 
-	rproc_del(scp->rproc);
-	scp_remove_rpmsg_subdev(scp);
-	scp_ipi_unregister(scp, SCP_IPI_INIT);
-	scp_unmap_memory_region(scp);
-	for (i = 0; i < SCP_IPI_MAX; i++)
-		mutex_destroy(&scp->ipi_desc[i].lock);
-	mutex_destroy(&scp->send_lock);
+	list_for_each_entry_safe_reverse(scp, temp, cluster, elem) {
+		list_del(&scp->elem);
+		rproc_del(scp->rproc);
+		scp_rproc_free(scp);
+	}
 
 	return 0;
 }
@@ -1073,12 +1184,19 @@ static const struct mtk_scp_of_data mt8195_of_data_c1 = {
 	.host_to_scp_int_bit = MT8195_CORE1_HOST_IPC_INT_BIT,
 };
 
+static const struct mtk_scp_of_data *mt8195_of_data_cores[] = {
+	&mt8195_of_data,
+	&mt8195_of_data_c1,
+	NULL
+};
+
 static const struct of_device_id mtk_scp_of_match[] = {
 	{ .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
 	{ .compatible = "mediatek,mt8186-scp", .data = &mt8186_of_data },
 	{ .compatible = "mediatek,mt8188-scp", .data = &mt8188_of_data },
 	{ .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
 	{ .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
+	{ .compatible = "mediatek,mt8195-scp-dual", .data = &mt8195_of_data_cores },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
-- 
2.18.0