[PATCH v11 06/11] remoteproc: mediatek: Probe multi-core SCP
Tinghan Shen
tinghan.shen at mediatek.com
Tue May 9 23:37:44 PDT 2023
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 of multi-core SCP to the 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 at mediatek.com>
---
drivers/remoteproc/mtk_scp.c | 135 ++++++++++++++++++++++++++++++-----
1 file changed, 117 insertions(+), 18 deletions(-)
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index ff73c6dd9637..87215a0e145e 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -864,7 +864,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
}
static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
- struct mtk_scp_of_cluster *scp_cluster)
+ struct mtk_scp_of_cluster *scp_cluster,
+ const struct mtk_scp_of_data *of_data)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
@@ -887,7 +888,7 @@ static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
scp = rproc->priv;
scp->rproc = rproc;
scp->dev = dev;
- scp->data = of_device_get_match_data(dev);
+ scp->data = of_data;
platform_device_add_data(pdev, &scp, sizeof(scp));
scp->reg_base = scp_cluster->reg_base;
@@ -938,10 +939,6 @@ static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
goto remove_subdev;
}
- ret = rproc_add(rproc);
- if (ret)
- goto remove_subdev;
-
return scp;
remove_subdev:
@@ -956,19 +953,116 @@ static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
return ERR_PTR(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_is_single_core(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev_of_node(dev);
+ struct device_node *child;
+
+ child = of_get_next_available_child(np, NULL);
+ if (!child)
+ return dev_err_probe(dev, -ENODEV, "No child node\n");
+
+ of_node_put(child);
+ return of_node_name_eq(child, "cros-ec-rpmsg");
+}
+
static int scp_cluster_init(struct platform_device *pdev)
{
- struct mtk_scp *scp;
+ struct mtk_scp *scp, *temp;
struct mtk_scp_of_cluster *scp_cluster = platform_get_drvdata(pdev);
struct list_head *cluster = &scp_cluster->mtk_scp_cluster;
- scp = scp_rproc_init(pdev, scp_cluster);
- if (IS_ERR(scp))
- return PTR_ERR(scp);
+ 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;
+ int core_id = 0;
+ int ret;
+
+ ret = scp_is_single_core(pdev);
+ if (ret < 0)
+ return ret;
+
+ if (ret) {
+ dev_dbg(dev, "single-core scp\n");
+
+ /* When using the SCP node phandle on exported SCP APIs, the drvdata
+ * is expected to be the mtk_scp object, and as a result, it is intended
+ * to be overwritten for single-core SCP usage.
+ */
+ scp = scp_rproc_init(pdev, scp_cluster, of_device_get_match_data(dev));
+ if (IS_ERR(scp))
+ return PTR_ERR(scp);
+
+ list_add_tail(&scp->elem, cluster);
+ } else {
+ dev_dbg(dev, "multi-core scp\n");
+
+ cluster_of_data = (const struct mtk_scp_of_data **)of_device_get_match_data(dev);
+
+ for_each_available_child_of_node(np, child) {
+ if (!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;
+ }
+
+ scp = scp_rproc_init(cpdev, scp_cluster, cluster_of_data[core_id]);
+ if (IS_ERR(scp)) {
+ dev_err(dev, "Failed to initialize core %d rproc\n", core_id);
+ put_device(&cpdev->dev);
+ of_node_put(child);
+ goto init_fail;
+ }
+ list_add_tail(&scp->elem, cluster);
+ put_device(&cpdev->dev);
+
+ core_id++;
+ }
+ }
- list_add_tail(&scp->elem, cluster);
+ 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)
@@ -1005,6 +1099,10 @@ static int scp_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&scp_cluster->mtk_scp_cluster);
platform_set_drvdata(pdev, scp_cluster);
+ ret = devm_of_platform_populate(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to populate platform devices\n");
+
ret = scp_cluster_init(pdev);
if (ret)
return ret;
@@ -1016,17 +1114,11 @@ static int scp_remove(struct platform_device *pdev)
{
struct mtk_scp_of_cluster *scp_cluster = platform_get_drvdata(pdev);
struct mtk_scp *scp, *temp;
- int i;
list_for_each_entry_safe_reverse(scp, temp, &scp_cluster->mtk_scp_cluster, elem) {
list_del(&scp->elem);
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);
+ scp_rproc_free(scp);
}
return 0;
@@ -1106,12 +1198,19 @@ 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
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